Construction Photo Album

Welcome!  Construction is well underway on the Hoover Dam Bypass Project: both the Arizona and the Nevada Approaches are finished and construction on the Colorado River Bridge is steadily progressing!  Scroll down the page (or use the Quick Jump menu) to see the most recent construction photos. As construction continues, this page will be updated periodically to give you a quick peek at the progress and on-going activities at the construction site.

Click on any thumbnail to view an enlarged version of that photo.  Please note that you will need to use the Back button on your browser to return to this page.  If you prefer a higher resolution image (300 dpi or more), you can also download these from our site using the High Resolution link located below each thumbnail.  Please note that these higher resolution images (which are provided in TIF format) will take longer to download.

Quick Jump:

Additional Images/Photos (Including Arizona Approach and the live webcam.)

Images from June & July 2010

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Images from May 2010

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Images from April 2010

Colorado River Bridge...

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Images from March 2010

Colorado River Bridge...

View of the bridge as seen from Nevada towards Arizona.

In the background, the Arizona approach roadway is visible.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) and the new US93 alignment as seen from above Hoover Dam.

The Arch is complete with all spandrel piers constructed. Steel girders remain to be placed for spans 6 and 7 and portion of span 14. Stay-in-place steel decking is erected between the girders at spans 10 and 11. Climbing scaffolding is attached to pier 6-RT column.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge).

Left side of the picture – Steel girders are staged on the approach deck, waiting to be set between the Arch spandrel piers. Stay-in-place steel decking is erected between the girders at spans 10 and 11.

Right side of the picture – A mobile crane is set on the deck, servicing workers below at the AZ skewback footing.

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View of the bridge as seen from Nevada towards Arizona.

Steel girders are staged on the Nevada approach deck, waiting to be set between the Arch spandrel piers. Stay-in-place steel decking is erected between the girders at spans 10 and 11.

In the background, the Arizona approach roadway is visible.

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Images from February 2010

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Images from January 2010

Colorado River Bridge...

A truck transports a 115’ long steel girder onto the NV approach and waits for off loading. Attached to the top flanges of the girder, above the end plate, are temporary support brackets the will suspend the girder in-place from the top of the pier cap until PT bars are installed through the holes in the end plate and attach the girder to the pier cap face.

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In the Obayashi / PSM, JV precast yard located near Boulder City, workers utilize a rubber tire gantry crane to hoist a 115’ long steel girder onto a truck for transport to the bridge site.

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The North highline hoists and transports a steel girder out onto the Arch for placement between Pier 10 and 11 spandrel column pier caps. On the NV approach deck, several girders are stage for sequenced placement. The South highline is in use, delivering materials to waiting crews on the Arch. To the bottom left of the picture, the orange stripping platform is cantilevered over the completed right barrier railing to allow worker access to the underside of the deck. Across the canyon, a Grove RT635C Crane sets on the AZ approach deck, above Pier 14, servicing crews working below on the AZ skewback.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

On the Nevada approach, piers 3, 4, and 5 are visible. On the Arch, all spandrel piers are completed with climbing scaffolding attached to piers 6-LT\RT and 13-LT columns. Pier 13-RT column has system scaffolding encasing it for worker access.

The north highline crane transports a steel girder out for erection between Pier 10 and 11 spandrel column pier caps. The South highline is returning after delivering crews to work areas on the Arch.

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Parked partially on the bridge deck at span 1, Olsen Beal crews attach highline crane rigging and prepare a steel girder for off loading. Safety lines have been installed to the tops of the web flanges. Temporary support brackets will be attached to web flanges above the end plates prior to setting this girder into its final position between two spandrel column pier caps.

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As seen from the existing US93 Hairpin in Nevada, the completed Arch spans across the Colorado River.

From right to left side of the picture – Spandrel Pier 6 is visible with climbing scaffolding attached to the left & right columns. Piers 7 through 13 are completed with pier caps in place. Steel girders spanning between pier 9 and 10 (span 10) and between 10 and 11 (span11) are erected with access scaffolding visible, suspended from the pier caps.

Spanning the canyon above the bridge are the twin cables of the highline crane systems.

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Images from December 2009

Colorado River Bridge...

View of two of four steel girders, set in place, spanning between piers 9 and 10. Suspended from the top of the piers caps, are temporary platforms to allow worker access for steel girder placement.

Utilizing the cantilevered man basket, suspended from the south highline, Obayashi / PSM, JV crews access the underside of the right Arch rib below pier 10 to perform finishing work of the Arch soffit.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

On the Nevada approach, piers 3, 4, and 5 are visible. On the Arch, Spandrel Piers 6 through 13 are completed with their caps spanning between the left and right columns. Two of four steel girders span between piers 9 and 10. Utilizing the cantilevered man basket, suspended from the south highline, Obayashi / PSM, JV crews access the underside of the right Arch rib to perform finishing work.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from existing US93 hairpin in Nevada.

Left to Right side of the picture – The completed Arizona approach with the deck constructed to Pier 14. Climbing scaffolding is attached to Pier 13-LT. Obayashi / PSM, JV crews remove system scaffolding from Pier 13-RT. Completed pier caps are visible for piers 13, 12, 11, 10, and 9 with temporary access platforms attached. Moveable access platforms ride the top of the Arch between piers 11 and 12 for finishing operations. Below the right arch rib, a cantilevered man basket is suspended from the south highline to allow finishing operations of the Arch soffit.

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On the Nevada approach deck, steel girders are staged with steel safety lines attached along the top of the upper flange. These girders, weighing upwards of 50 tons will be transported by the highline crane and placed to span between the spandrel pier caps, on top of which, the concrete roadway deck will be constructed.

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On the Nevada approach deck, Obayashi / PSM, JV crews place concrete to construct the southbound right side barrier railing.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture – The completed Nevada approach with the deck constructed to Pier 5. Obayashi / PSM, JV crews continue constructing the southbound right side barrier railing. Steel girders are staged on the deck, awaiting placement between spandrel piers.

Right side of the picture – all spandrel piers and pier caps are completed. Scaffolding encases piers 6, 7, and 13. Temporary platforms are suspended from the tops of the piers caps to allow worker access for steel girder placement.

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Images from November 2009

Colorado River Bridge...

View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

On the Nevada approach, piers 2, 3, 4, and 5 are visible. On the Arch, Pier 6 is erected to segment 13, Piers 7, 8, 9, 10, 11 and 12 are completed with the falsework for their pier caps spanning between the left and right columns, and Pier 13 is completed with the climbing scaffolding attached at the bottom of the left column.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture – The completed Nevada approach with the deck constructed to Pier 5. Obayashi / PSM, JV crews construct formwork for the southbound right side barrier railing.

Right side of the picture – all spandrel piers are completed with the exception of Pier 6. Falsework and formwork for Piers 7 and 12 spans between their left and right columns. Caps at Piers 8, 9, 10, and 11 are completed and formwork removed.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from the deck at Pier 5.

Spandrel Pier 6-right is erected to segment 18, Pier 6-left to segment 16. Utilizing the highline, Olsen Beal crews are transported off of Pier 6-left in a man basket. Pier 6-right is completed with its 18th segment set. Further out on the Arch, Pier 7 is completed with the falsework and formwork for the pier cap in place. Spanning between the left and right ribs of the Arch at each pier, precast concrete panels encase the steel strut members.

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As seen from the existing US93 Hairpin in Nevada, the completed Arch spans across the Colorado River.

From right to left side of the picture – Spandrel Pier 6-right is erected to segment 18, Pier 6-left to segment 16. Pier 7 is completed with the falsework and formwork for the pier cap in place. Caps at Piers 8, 9, 10 and 11 are completed with their formwork stripped. Falsework and formwork for Pier 12’s cap is set.

Spanning the canyon above the bridge are the twin cables of the highline crane system.

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On the Nevada approach, Obayashi / PSM, JV crews set formwork for the southbound right side barrier railing. A Quality Control field engineer inspects the operation.

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Underside view of the bridge as seen from the existing US93 at the Nevada Hairpin. Utilizing an under slung mobile scaffolding, Obayashi / PSM, JV crews remove deck overhang brackets from spans 1 and 2. High above the deck, the highline cranes transport materials out to the Arch.

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The Arizona Approach as viewed from the Hoover Dam parking lot in Arizona.

From left to right side of the picture – the completed deck and Pier 14. Pier 13 is completed, awaiting placement of pier cap falsework. Piers 12 and 11 are completed with formwork and falsework in place for the caps. Scaffolding encases the columns of Piers 11, 12, and 13-left for worker access. At the far right, the cap of Pier 10 is visible above the Arch. A temporary access bridge spans between the skewback footing of Pier 14 and the Arch at Pier 13.

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Images from October 2009

Colorado River Bridge...

On the Arizona approach, Olsen Beal crews remove the temporary pylons from above Pier 14 using a Liebherr LTM1400-7.1 crane.

Right Center of the picture – Utilizing the highline crane, Olsen Beal crews erect segment 5 of Pier 11-left.

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On the Nevada approach, Obayashi / PSM, JV crews assemble pier cap falsework and formwork.

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On the Nevada approach, a delivered precast spandrel column segment waits to be transported out onto the Arch by the highline crane system. Crews attach temporary platforms to the sides of the segments for worker access. Steel post tensioning rods are pre-loaded into the vertical ducts in the segment walls along with a survey prism, attached to the upper portion of this segment prior to transportation.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from the right side of abutment 1.

Left side of the picture – The completed Nevada approach, with piers 4 and 5 visible.

Center to Right side of the picture – Pier 7 is erected to segment 3. Piers 8, 9, 10, and 11 are complete and have cap falsework in place. Between the two Arch ribs, the steel struts are encased in pre-cast concrete panels.
 

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

On the Nevada approach, piers 3, 4, and 5 are visible. On the Arch, spandrel columns are completed at Piers 8, 9, 10, and 11 with the falsework for their pier caps spanning between the left and right columns. Pier 7 is erected to segment 4, Pier 12-left to segment 7 and Pier 12-right to segment 10.

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Left side of the picture – Utilizing the highline crane, Olsen Beal crews erect segment 2 of Pier 13-right. Pier 13-left has segment 1 erected on top of the plinth. To the left of Pier 13, an access bridge spans between the Arch and Pier 14

Right side of the picture – Pier 12-right is erected to segment 9 while Pier12-left to segment 7.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

Left side of the picture – The pier cap falsework is erected on top of Piers 8, 9, and 10. Olsen Beal crews continue erecting precast concrete spandrel pier column segments at Pier 7.

Right Center of the picture – the completed Nevada approach is visible.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from above the left side of abutment 2, facing Nevada.

Left side of the picture – The completed Arizona approach and Pier 14.

Center to Right side of the picture – The completed Arch with spandrel columns in various stages of completion. Pier 13-left has segment 1 erected, Pier 12-right is erected to segment 10, Pier 12-left to segment 7, Pier 11 is complete with the cap falsework spanning between the columns. Behind Pier 11, completed Piers 10, 9, and 8 are visible. The steel struts between the two Arch ribs are encased in pre-cast concrete panels.

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As seen from the existing US93 Hairpin in Nevada, the completed Arch spans the Colorado River.

Formwork for Pier 6 plinths are in place. Pier 7 is erected to segment 3; Piers 8, 9, 10, and 11 are complete and have cap falsework in place. Between the two Arch ribs, pre-cast concrete panels encase the steel struts.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from the right side of abutment 1.

Right Center of the picture – The Arch is complete. An Arch strut is erected between the ribs at Pier 6 and precast concrete spandrel pier column segments at erected at Pier 7.

Left Center of the picture – On the Nevada approach, pier cap falsework is being constructed.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from above the left side of abutment 2, facing Nevada.

On the Arch, Olsen Beal crews are erecting precast concrete spandrel pier segments at Piers 7, 8, 9, 10, 11, and 12. Temporary platforms are attached to the sides of the segments for worker access.

On the Nevada approach, pier cap falsework is being constructed. Once finished, they will be transported out and attached to, and span between, the completed pier columns.

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Images from September 2009

Colorado River Bridge...

View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from Hoover Dam.

The Arch is completed with a majority of the temporary forestays and backstays removed. The temporary pylons for the cable stays remain standing on top of Pier 5 (Nevada) and 14 (Arizona). Utilizing the highline crane, Obayashi / PSM, JV crews remove work platforms from on top of Arizona pylons.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from the left side of abutment 2, facing Nevada.

The Arch is completed with a majority of the temporary stays removed. Obayashi / PSM, JV crews are installing the precast concrete panels around the Arch strut at Pier 11. Formwork is set for construction of the spandrel column plinths at Piers 10, 11, 12, and 13.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from the right side of abutment 1 with a majority of the temporary stays removed. Obayashi / PSM, JV crews are in the process of removing the remaining stays and temporary pylons. On the Arch, work is progressing to construct the plinths for the spandrel columns and installation of the precast concrete panels around the Arch struts.

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Obayashi / PSM, JV crews removing the stay cables from the temporary pylons on the Nevada approach, above Pier 5.

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Obayashi / PSM, JV crews removing the stay cables from the temporary pylons on the Nevada approach, above Pier 5.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from the right side of abutment 1.

Left side of the picture – Olsen Beal crews continue removal of the temporary pylons from above Pier 5 using a Liebherr LTM1400-7.1 crane.

Right Center of the picture – the completed Arch with precast spandrel column segments erected at Piers 8-LT\RT, 9-LT, 10-LT, and 11-LT\RT.  Crews are at Pier 10-RT waiting for the highline to deliver its first segment.

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Using a crawler crane, Olsen Beal crews unload a precast Spandrel column segment and prepare it for transport to Pier 10 by the highline crane. The segment has work scaffolding attached to the exterior sides and vertical post tensioning bars inserted into the ducts.

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Left side of the picture – on the Nevada approach, above Pier 5, Olsen Beal crews continue removal of the temporary pylons using a Liebherr LTM1400-7.1 crane.

Center of the picture – the south highline crane carries a precast Spandrel column segment out for erection at Pier 10.

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Images from August 2009

View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from along side of Abutment 2 in Arizona.

The Nevada and Arizona Arch cantilevers are constructed to segment 26 with the closure segment remaining to be constructed. The temporary stay system is complete with all the forestay/backstays installed.

Spanning between the two ribs of the Arch are the Arch struts (grey steel X structures), connecting the ribs together.

At the right side of the picture, the Nevada approach is visible.
Spanning the canyon, above the temporary pylon is the highline crane system.

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Left side of the picture – The Arizona Arch headings are constructed out to segment 26 with all the forestays installed. Spanning between the two ribs is a temporary strut which will be kept in place until the permanent Arch strut is erected at segment 24.

Right side of the picture - The Nevada Arch headings are constructed out to segment 26 with all the forestays installed and the permanent Arch strut erected at segments 19 & 24.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from below. The Arch cantilevers are nearing connection with the closure segment remaining to be constructed.

Left side of the picture – The Nevada Arch cantilevers are constructed out to segment 26. Arch struts are erected between the ribs at segments 19 & 24.

Right side of the picture - The Arizona Arch headings are constructed out to segment 26. An Arch strut is erected between the ribs at segments 19, with a temporary strut at segment 23

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from Hoover Dam.

The Nevada and Arizona Arch cantilevers are constructed to segment 26 with the closure segment remaining to be constructed.

The temporary pylons for the cable stays are constructed on top of Pier 5 in Nevada with all the Forestay/backstays installed.

Arch struts (grey steel X structures), connecting the two Arch ribs, are constructed at Nevada segments 7, 13, 19, and 24. On top of the Arch ribs, at these locations, precast column segments for the spandrel piers will be erected.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture – The Nevada approach is visible with the Arch headings projecting outward to segment 26 with all Stay systems installed.

Right side of the picture - The Arizona approach is visible with the Arch headings projecting outward to segment 26 with all Stay systems installed.

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Left side of the picture – The Arizona Arch headings are constructed out to segment 26 with all the forestays installed. Spanning between the two ribs is a temporary strut which will be kept in place until the permanent Arch strut is erected at segment 24.

Right side of the picture - The Nevada Arch headings are constructed out to segment 26 with all the forestays installed and the permanent Arch strut erected at segment 24.

Obayashi / PSM, JV crews are currently constructing formwork for the closure segment to complete the connection between the Nevada and Arizona cantilevers.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Both ribs of the Arch are constructed to segment 26 with the form travelers removed. Stay system installation is completed. At the center of the Arch, light can be seen coming from the interior of the Arch ribs, shining through the gap between the Nevada and Arizona cantilevers.

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Images from June 2009

Colorado River Bridge...

View of the Arizona approach of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge).

The temporary pylons for the cable stays are constructed on top of Pier 14. The Arch projects outward to segment 22 with forestay cables spanning between the pylons and the Arch. Backstays span between the temporary pylon and the backstay anchor block.

Arch struts (grey steel X structures), connecting the two Arch ribs, are constructed at Arizona segments 7, 13, and 19. On top of the Arch ribs, at these locations, precast column segments for the spandrel piers will be erected.

Forestays 11 are installed into the temporary pylon heads, waiting installation into the Arch ribs at segments 22. Backstays F are fabricated on the Arizona approach and await installation.

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View of the Nevada approach of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge).

The temporary pylons for the cable stays are constructed on top of Pier 5. The Arch projects outward to segment 22 with forestay cables spanning between the pylons and the Arch. Backstays span between the temporary pylon and the backstay anchor block.

Arch struts (grey steel X structures), connecting the two Arch ribs, are constructed at Nevada segments 7, 13, and 19. On top of the Arch ribs, at these locations, precast column segments for the spandrel piers will be erected.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from above Hoover Dam.

Left side of the picture – The Arizona approach is visible with the Arch headings projecting outward to segment 23.

Right side of the picture - The Nevada approach is visible with the Arch headings projecting outward to segment 22.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture – In Nevada, both ribs of the Arch are constructed to segment 22. The form travelers are launched out to segment 23 with forestays installed to segment 20.

Right side of the picture - In Arizona, both ribs of the Arch are constructed to segment 22. The left form traveler is launched out to segment 23 with forestays installed to segment 20.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) with Hoover Dam and Lake Mead in the background.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge).

Left side of the picture – The Arizona approach alignment along with the Kingman Wash interchange and the Sugar Loaf Mountain Bridge.

Right side of the picture - The construction office complex situated in the future Pedestrian Plaza parking lot. The almost complete pedestrian access ramp zigzags up the mountain side from the office area to the bridge abutment 1.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) and the new US93 alignment as seen from above Hoover Dam.

Lower Left to top right of the picture – The current US93 alignment winds from Arizona, across Hoover Dam, and on into Nevada.

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Images from May 2009

Colorado River Bridge...

In the foreground, an Obayashi / PSM, JV worker and QC engineer place imbeds and adjust reinforcing steel in preparation for top slab exterior formwork to be set on segment NV22-LT in Nevada.

In the background, the left and right Arch ribs project outward from the AZ skewback footing.

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View of the left / right Arch ribs as they project outward from the AZ skewback footing. The outer form of the form traveler on the left rib is launched out to segment 22 and is waiting for the reinforcing steel cage to be set. The form traveler on the right rib is currently at segment 21 and crews are removing the top slab exterior formwork and preparing for the collapsing of the inner core formwork. The south highline crane is being rigged to the formwork preparing for removal.

The forestays are visible, spanning from the temporary pylon above Pier 14 and connecting to the Arch.

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Arch segment NV19-LT diaphragm / arch strut post-tensioning blister formwork prior to concrete placement as viewed from inside the Nevada right arch rib. To the left and right, the temporary forestay blister can be seen as constructed alongside the Arch interior wall. Below the blisters are blockouts in the floor slab where the temporary strut will be attached to the underside of the Arch with post tensioning bars.

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Working within the confines of a temporary platform at the Pier 8 Arch strut and outfitted with personal fall protection equipment, Obayashi / PSM, JV personnel set blockouts for the transverse post-tensioning bars that will attach the strut, connecting the left and right arch ribs.

On top of the Arch rib, to the right, a template that holds the vertical post-tensioning bars where the pier 8 right column is to be erected can be seen. Connected to the exterior of the Arch and wrapped in white Burlene, is the concrete supply pipe, spanning between the stationary concrete pump at the NV hairpin and the placing boom. Access to the strut is provided through the round access hatch in the Arch wall.

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Looking back station down the exterior of the right arch rib in Nevada at the forestays as they project downward from the temporary pylons erected on top of pier 5. In the foreground, a template holds the vertical post-tensioning bars where the pier 8 south column is to be erected. To the right, Obayashi / PSM, JV personnel, outfitted with personal fall protection equipment, work within the confines of a temporary platform, stripping formwork and preparing for the arch strut placement.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture – In Nevada, the right rib of the Arch is constructed to segment 21 and the form traveler is launched out to segment 22 on the left rib. Crews are currently installing forestays to segment 22 and backstays to the backstay anchor block on the NV approach.

Right side of the picture – The Arch, constructed to segment 21, from the AZ skewback. A temporary bridge spanning between Pier 14 and the Arch can bee seen. This allows simplified construction worker access to the Arch from the Arizona approach area.

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Images from April 2009

Colorado River Bridge...

View of the Arch as seen from the existing US93 at the Nevada hairpin.

Left side of the picture – The right and left Arch ribs cantilever from the AZ skewback out to segment 17. A temporary work platform spans between the ribs at segment 13 to allow for installation of the steel strut.

Right side of the picture – The Arch cantilevers out to segment 19 in NV. The temporary forestay cables support the Arch until Arch completion. Crews are in the process of installing forestays into the Arch behind the form traveler system. A stairway system is attached to the outside of the Arch for access to the form travelers.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture – The Arch, constructed to segment 19 from the NV skewback. Crews are in the process of installing forestays into the Arch behind the form traveler system.

Right side of the picture – The Arch, constructed to segment 17, from the AZ skewback.

At the leading edge of the Arch cantilevers, crews continue to advance the form travelers and construct Arch segments.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture – The completed Nevada approach with the temporary pylons for the cable stays constructed on top of Pier 5. The Arch projects outward to segment 19 with forestay cables spanning between the pylons and the Arch.

Right side of the picture – The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. The Arch projects outward to segment 17 with forestay cables spanning between the pylons and the Arch.

Spanning the canyon overhead are the twin cableway cranes.

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At the south back stay anchor block in Arizona, an Obayashi / PSM, JV crew utilize hydraulic post-tensioning jacks to simultaneously stress a set of back stays. These stays span between the anchor block and the temporary pylon head above Pier 14.

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On top of the South temporary pylon above Pier 14 in Arizona, an Obayashi / PSM, JV crew position hydraulic post-tensioning jacks in preparation of stressing of a set of forestays connected to the Arch.  These cables span between the temporary pylon head above Pier 14 and the arch.

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Images from March 2009

Colorado River Bridge...

Nevada Approach and Arch headings as viewed from the crest of Hoover Dam. The left and right ribs of the Arch are constructed out to segment 16. Six sets of forestay cables span from the Arch ribs to the temporary pylons heads and Six sets of backstays span between the head and the backstay anchor block.

Between the Arch ribs are the steel Strut assemblies, located where spandrel Piers columns 6 and 7 will be erected.

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As seen from the existing US93 Hairpin in Nevada, the left and right Arch ribs project outwards over the Colorado River. Forestay cables span from the Arch ribs to the temporary pylons above.

The Arch strut, connecting the two Arch ribs, is constructed at segment 7. On top of the Arch ribs, at this location, precast column segments for Pier 6 will be erected.

Attached to the top of the Arch ribs are temporary stairs, work platforms, and cross rib access walkways. Workers climb these stairs daily on their way to the form travelers.

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View of the Nevada left from traveler, as seen from the right traveler.

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Looking up from the Nevada Arch rib towards the temporary pylons above. Forestays span between the pylon heads and the Arch ribs, sheathed in white HDPE casing. To the left of the left pylon, a set of scaffolding stairs are attached to allow personnel access to the pylon heads. These 155’ tall pylons will remain in place with the stays attached to support the Arch until the Arch is completed. After completion, all forestays, back stays, and pylons will be removed.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture - The Arch, constructed to segment 16 from the NV skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the temporary pylons and the backstay anchor block.

Right side of the picture - The Arch, constructed to segment 15, from the AZ skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 14 and backstays span between the head and the backstay anchor block.

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Aerial view of the Mike O'Callaghan-Pat Tillman Memorial Bridge looking to the north from above the Arizona side of the canyon.  The Arch is approximately 55% complete.

Left side of the picture – The Nevada approach is visible with the Arch headings projecting outward from the canyon wall. The Arch is constructed to segment 15.  Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the temporary pylon and the backstay anchor block.

Right side of the picture – The Arizona approach is visible with the Arch headings projecting outward to segment 14.  A set of backstay cables are attached to the pylon heads, waiting tensioning as Arch construction progresses outward.

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Aerial view of the Mike O'Callaghan-Pat Tillman Memorial Bridge looking to the south from above the Arizona side of the canyon.

Left side of the picture –

Backstay cables extend from the pylons to the backstay anchor blocks.  One set of backstays are attached to the pylon head, waiting tensioning as Arch construction progresses outward.  A set of scaffolding stairs are attached to the South pylon to allow personnel access to the pylon heads.

Right side of the picture – The Arizona approach is visible with the left and right Arch ribs constructed to segment 15.  The form travelers are at segment 16 with the reinforcing cages installed.  Five sets of forestay cables extend from the temporary pylons above Pier 14 and attach to the Arch ribs.

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Images from February 2009

Colorado River Bridge...

View of the Obayashi / PSM, JV on-site concrete batch plant. From this plant, all concrete for the project is currently being produced.

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View of the Arch from the existing US93 Nevada at the hairpin. A concrete truck delivers another load of concrete to the awaiting pump in Arizona

Foreground - From Nevada, the Arch, projects outward from Pier 5 skewback footing. The vertical post tensioning bars extend upwards from the Arch rib where Pier 6 will be erected, on each side of the steel Arch strut that connects the two ribs. The form travelers are at segment 13.

Background - The Arizona approach and Arch ribs are visible across the canyon.

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Obayashi / PSM, JV crews unload concrete into the re-mixer and concrete pump located on the Arizona skewback footing at Pier 14. Concrete is delivered to the pump by the cableway crane system via an 8cy concrete bucket. From the pump, concrete is conveyed to the placing boom where it is directed into the formwork of the Arch segment under construction.

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Inside the form traveler system at Arch Segment NV13-LT, Obayashi / PSM, JV crews placed concrete into the bottom slab formwork. The slick line from the end of the placing boom is directing the flow of concrete through an open pour window in the formwork. Other crew members consolidate the placed concrete while carpenters follow behind and close the windows securely as placement advances.

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Nevada Approach and Arch headings as viewed from the crest of Hoover Dam during night time operations. The left and right ribs of the Arch are constructed out to segment 13.

Four sets of forestay cables span from the Arch ribs to the temporary pylons heads and the two sets of backstays span between the head and the backstay anchor blocks. Additional forestays and backstays are installed to the pylon heads, waiting tensioning as Arch construction progresses outward.

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Arizona Approach as viewed from the crest of Hoover Dam during night time operations. The left and right ribs of the Arch are constructed out to segment 12 with the form traveler advanced to segment 13 where construction crews place concrete for segment 13-LT. The concrete placing boom reaches out from segment 11 and directs pumped concrete into the formwork. Concrete is delivered by an 8cy bucket from the bridge deck at Pier 14 to the awaiting concrete pump at the skewback footing, where it is pumped up the North Arch rib in a pipe to the placing boom.
Four sets of forestay cables span from the Arch ribs to the temporary pylons heads and the two sets of backstays span between the head and the backstay anchor blocks.

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View of the Mike O'Callaghan-Pat Tillman Memorial Bridge as seen from downstream of Hoover Dam. Presently the Arch is approximately 50% complete.

Left side of the picture - The Arch, constructed to segment 13, from the NV skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.
Right side of the picture - The Arch, constructed to segment 12, from the AZ skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 14 and backstays span between the head and the backstay anchor block.

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On the Nevada Arch headings, Obayashi / PSM, JV crews launch the inner core of the form traveler and position it in place for the next segment to be constructed.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from the deck of the bridge at Pier 14, looking towards Nevada.

Top Left side of the picture – The left and right Arch ribs project outward from the Nevada skewback, currently constructed to segment 13.

Bottom of the picture – The left and right Arch ribs in Arizona are visible, currently constructed to segment 13. Temporary stay cables, sheathed in white HDPE casing, extend down to the Arch from the temporary pylons above Pier 14.

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Images from January 2009

Colorado River Bridge...

Crews from Steel Engineers complete the relocation of the pre-assembled Arch Segment NV13-RT reinforcing steel cage from the fabrication template on the Arizona approach to a staging bed. This cage weighs approximately 25 tons.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from the South side of Abutment 2 in Arizona.

Right side of the picture – The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. The right and left Arch ribs are constructed to segment 10 with the Arch strut installed at segment 7.

Center of the picture – The completed Nevada approach with the temporary pylons for the cable stays erected on top of Pier 5. The right and left Arch ribs are constructed to segment 12 with the Arch strut installed at segment 7.

Left side of the picture – Obayashi / PSM, JV survey crew set up to survey across the canyon to a rod man on the North Arch rib to make geometry control adjustments to the form traveler.

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At the top of the South temporary pylon in Arizona, Obayashi / PSM, JV crews utilize a winch system to pull into place backstay AO.

Visible at the right of this picture, forestays 3, 4, and 5 are installed, connecting to and supporting the right Arch rib.

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Looking down at the backstay anchor blocks, from the top of the South temporary pylon in Arizona, Obayashi / PSM, JV crews fabricate the next series of stay cables in the tray laying on the roadway alignment.

At the top of the picture, the North and South backstay anchor blocks are seen with stays DI and DO installed in each. Crews are preparing for the installation of backstays AI and AO.

Visible near the top right of the picture, the inner core launching rail of the right form traveler is being hoisted by the cableway crane for placement on the form traveler at the leading edge of the right Arch rib.

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Looking down on the Arch from the roadway deck above Pier 5 in Nevada, the right and left Arch ribs project outward over the Colorado River below.

The left and right Arch ribs are constructed out to segment 12 with reinforcing cages set for segments 12. Obayashi / PSM, JV carpenter crews prepare to launch the inner core formwork of the form travelers and install top slab formwork.

The Arch strut, connecting the two Arch ribs, is constructed at segment 7. On top of the Arch ribs, at this location, precast column segments for Pier 6 will be erected. A temporary bridge allows worker’s access to the Arch from the existing US93 near the Nevada hairpin area.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from the crest of the Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right. Temporary pylons for the cable stays are constructed on top of Piers 5 and 14 with forestay cables spanning from the Arch ribs to the temporary pylons heads and backstays spanning between the heads and the backstay anchor blocks.

The Arch is constructed to segment 10 in Arizona and to segment 12 in Nevada.

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Images from December 2008

Colorado River Bridge...

View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from the deck of the bridge at Pier 5, looking towards Arizona.

The right and left Arch ribs are constructed out to segment 10. The left rib has the reinforcing steel cage set for segment 11. Visible at segment 7 is the steel strut member that connects both ribs together. Temporary stay cables, sheathed in white PVC casing, are attached to the arch ribs at segments 6, 8, and 10.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from downstream of the Hoover Dam.

Left side of the picture - The Arch, constructed to segment 10, from the NV skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.

Right side of the picture - The Arch, constructed to segment 10, from the AZ skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.

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Left side of the picture - The inner core of the Arizona South form traveler system, weighing approximately 30 tons, is removed from the Arch and carried by the South highline to the Arizona approach for form resurfacing.

Right side of the picture – The two temporary pylons above Pier 14 rise 155’ above the bridge deck. These towers are part of the cable stay erection system that will support the arch ribs until closure.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) from the deck of the bridge at Pier 14, looking towards Nevada.

Top Left side of the picture – The left and right Arch ribs project outward from the Nevada skewback.

 
Center Left side of the picture – The inner core of the Arizona South form traveler system is being hoisted by the highline crane for resurfacing of the form panels.

Bottom of the picture – The left and right Arch ribs in Arizona are visible with both inner core forms removed. Temporary stay cables, sheathed in white PVC casing, extend down to the Arch from the temporary pylons above Pier 14.

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On the Arizona approach, Obayashi / PSM, JV carpenter crews resurface the inner core of the form traveler.

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Images from November 2008

Colorado River Bridge...

Inside the Nevada left Arch rib, an Obayashi / PSM, JV carpenter constructs formwork for the diaphragm at Arch segment NV07-LT. The portal through the wall of the Arch rib will allow access to the strut.

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Inside the Nevada left Arch rib, an Obayashi / PSM, JV carpenter prepares to set formwork for the diaphragm at Arch segment NV07-LT. Water will be pumped through the grey tubing after concrete placement to cool the concrete during the curing period. The white ducts encase the post tensioning bars that will extend upwards through the exterior of the Arch rib, for the Pier 6 Left column.

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Arizona Approach as viewed from the crest of Hoover Dam during night time operations. The left and right ribs of the Arch are constructed out to segment 9 with the form traveler advanced to and preparing for construction of segment 10. The first and second sets of forestay cables span from segments 6 and 8 to the temporary pylons heads and the first set of backstays span between the head and the backstay anchor block. Connecting the two ribs at segment 7 is a temporary strut. This will remain in-place until the permanent strut is erected.

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As seen from the existing US93 Hairpin in Nevada, the left and right Arch ribs project outwards over the Colorado River. The form traveler systems are secured to segments NV10 and cantilevers out to form segment NV11. Forestay cables span from the Arch ribs to the temporary pylons above. The vertical post tensioning bars extend upwards from the Arch rib where Pier 6 will be erected.

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Nevada Approach and Arch headings as viewed from the crest of Hoover Dam during night time operations. The left and right ribs of the Arch are constructed out to segment 10. The first and second sets of forestay cables span from the Arch ribs to the temporary pylons heads and the first set of backstays span between the temporary pylon head and the backstay anchor block.

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View of an Arch strut as pre-assembled on the Arizona Approach. This strut will be transported by the cableway cranes where it will be erected between the Arch ribs at segment NV07.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen during night time operations from downstream of Hoover Dam.

Left side of the picture - The Arch, constructed to segment 10, from the NV skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.

Right side of the picture - The Arch, constructed to segment 9, from the AZ skewback. Forestay cables span from the Arch ribs to the temporary pylons above Pier 5 and backstays span between the head and the backstay anchor block.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from the roof of the Hoover Dam operations building.

Piers 15 and 14 appear to the left in this picture, while Pier 5 and 4 appear to the right. Temporary pylons for the cable stays are constructed on top of Piers 5 and 14. The Arch projects outward from the skewback footings at the base of Piers 5 and 14 while the twin cableway cranes traverse the canyon above.

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Images from October 2008

Colorado River Bridge...

Looking across the canyon from the bridge deck above Pier 5, the left and right ribs of the Arizona Arch headings project outward from Pier 14 skewback footing. Above the bridge deck, the temporary pylons for the cable stays rise 155’. The pylon heads are accessed by climbing the scaffolding stairway, attached to the right pylon.

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Arizona Approach and Arch headings as viewed from the crest of Hoover Dam. The left and right ribs of the Arch are constructed out to segment 8 with the form traveler advanced to and preparing for construction of segment 9. The first set of forestay cables span from the Arch to the temporary pylons heads and the first set of backstays span between the head and the backstay anchor block. The North cableway crane is lowering materials to the awaiting crews at the form travelers.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from the crest of the Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right. Temporary pylons for the cable stays are constructed on top of Piers 5 and 14. The Arch projects outward from the skewback footings at the base of Piers 5 and 14.

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Nevada Approach and Arch headings as viewed from the crest of Hoover Dam. The left and right ribs of the Arch are constructed out to segment 9. The first and second sets of forestay cables span from the Arch ribs to the temporary pylons heads and the first set of backstays span between the head and the backstay anchor block.

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Looking across the canyon from the bridge deck above Pier 14, the left and right ribs of the Nevada Arch project outward from Pier 5 skewback footing. Above the deck, are the temporary pylons for the cable stays with two sets of stays set in place for each Arch rib. Beyond the pylons, the towers of the cableway cranes are luffted to the North and South to position the loads they are hoisting above their respective work areas. At the top left of this picture, chains are visible, hanging down from the South cableway crane hook.

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Looking down on the Arch from the roadway deck above Pier 5 in Nevada, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The left Arch rib is constructed out to segment 9 and awaits the advancement of the form traveler. A temporary bridge allows worker’s access to the Arch from the existing US93 near the Nevada hairpin area.

Right side of the picture – The right Arch rib is constructed to segment 8 and has the form traveler set for construction of segment 9. Obayashi / PSM, JV carpenter crews prepare to install top slab formwork.

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Inside the Nevada left Arch rib, Steel Engineer’s iron workers place reinforcing steel to construct the diaphragm at Arch segment NV07-LT. Directly above this diaphragm, on the exterior of the Arch rib, precast segments for Pier 6 Left will be erected.

Visible through the reinforcing steel, daylight shines in from the leading face of the form traveler.

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As seen from the leading edge of the Nevada left from traveler, the right traveler is set for construction of Arch segment NV10-RT. Looking back down the Arch, the curvature takes shape.

The right column of Pier 5 projects from the Nevada skewback footing. The fore cable stays, wrapped in white PVC sheathing, can be seen extending from the Arch, to the temporary pylons above Pier 5.

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Images from September 2008

Colorado River Bridge...

Left side of the picture –  From the bridge deck of the Arizona approach, a pre-assembled reinforcing cage for Arch segment NV07-RT is hoisted by the South Cableway Crane and carried across the canyon.

Right side of the picture – The temporary pylons for the cable stays are constructed on top of Pier 14. The backstay cables have been installed in the pylon head and await installation into the backstay anchor block.

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Crews from Steel Engineers prepare to set the pre-assembled reinforcing cage for Arch segment NV07-RT into the form traveler formwork.

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A carpenter foreman from the Obayashi / PSM, JV stands atop the leading edge formwork of Arch segment NV08-LT, conversing with crews working on the adjacent segment NV07-RT.

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Obayashi / PSM, JV’s crews install embedments into the top slab prior to completion of formwork for Arch segment NV07-RT.

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As seen from the Pier 5 skewback footing in Nevada, the left and right Arch ribs extend outwards towards Arizona with work continuing to cast segments NV07.

Across the canyon, columns of Pier 14 and the temporary pylons are visible.

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Looking down on the Arch from the roadway deck above Pier 14 in Arizona, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The right Arch rib is constructed out to segment 6.  Using the Cableway Crane, iron workers place the pre-assembled reinforcing cage for segment 7.

Right side of the picture – The left Arch rib is constructed to segment 6 and has the form traveler set for construction of segment 7.

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Obayashi / PSM, JV’s crews constructing formwork for Arch segment NV07-LT.

Across the canyon, columns of Pier 14 temporary pylons, and the AZ Arch are visible along with the Cableway Crane, lowering the pre-assembled reinforcing cage for segment AZ-07 RT.

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Lower right side of the picture – A pre-assembled reinforcing cage for Arch segment AZ07-RT is hoisted by the South Cableway Crane and carried across the canyon past the Arizona right form traveler.

Center of the picture – The temporary pylons for the cable stays rise 155’ above the Arizona approach bridge deck at Pier 14. Temporary cable stays are installed from the Arch to the pylon head and will be used to support the Arch until the closure segment is constructed. Near the bottom, the left and right Arch ribs project outwards from the Pier 14 skewback footing, with the form travelers set for Arch segments AZ07 left and right.

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Arizona Approach as viewed from down stream of Hoover Dam. The left and right ribs of the Arch are constructed out to segment 6 with the form traveler advanced to and preparing for construction of segment 7. The first set of forestay cables span from segment 6 to the temporary pylons heads and the first set of backstays span between the head and the backstay anchor block.

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Images from August 2008

Colorado River Bridge...

View of the Arizona approach as seen from the crest of Hoover Dam.

The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. At the base of Pier 14, the left Arch rib is visible.

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View of the pre-assembled arch reinforcing steel cages stockpiled on the Arizona approach.

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Looking down on the Arch from the roadway deck above Pier 14 in Arizona, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The right Arch rib is constructed out to segment 6 and awaits concrete placement.

Right side of the picture – The left Arch rib is constructed to segment 6 and has the concrete placing boom extended to the right Arch rib in preparation of concrete placement.

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Crews from Steel Engineers assembling arch reinforcing steel in a template on the Arizona approach.

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View of the temporary stay cable pylons constructed above Pier 14 in Arizona. Crews are working on erecting the stairway scaffolding to allow access to the pylon heads. Spanning overhead are the twin cableway crane systems.

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View of the Arch struts as stockpiled on the Arizona Approach. Once assembled, the strut will span between the Arch ribs to maintain alignment.

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As seen from the existing US93 Hairpin in Nevada, the left and right Arch ribs project outwards over the Colorado River. The form traveler systems are secured to segments NV06 and cantilevers out to form segment NV07. the form traveler on the right rib of the Arch has it’s left external form panel removed for maintenance.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from the crest of the Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right. Temporary pylons for the cable stays are constructed on top of Piers 5 and 14. The Arch projects outward from the skewback footings at the base of Piers 5 and 14.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture – The completed Nevada approach with the temporary pylons for the cable stays constructed on top of Pier 5. At the base of Pier 5, the right Arch rib is visible.

Right side of the picture – The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. At the base of Pier 14, the right and left Arch ribs are visible.

Spanning the canyon overhead are the twin cableway cranes.

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View of the constructed stay cables as they lay on the Nevada approach bridge deck, waiting insertion into the Arch and temporary pylon head. These cables are part of the cable stay erection system that will support the arch ribs until closure.

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Images from July 2008

Colorado River Bridge...

Obayashi / PSM, JV’s temporary concrete batch plant, located in the Boneyard laydown area.

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View of the south temporary stay cable anchor and highline crane at the Abutment 1 area in Nevada. Utilizing steel beams, Obayashi / PSM crews construct trays for fabrication of the stay cables between the tower bases.

The south temporary stay cable anchor is exposed and is waiting installation of the stays. The south highline crane system is currently luffed to the north for delivery of materials to the Arch.

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Looking down on the Arch from the roadway deck above Pier 5 in Nevada, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The left Arch rib is constructed out to segment 6 and awaits the advancement of the form traveler. A temporary bridge allows worker’s access to the Arch from the existing US93 near the Nevada hairpin area.

Right side of the picture – The right Arch rib is constructed to segment 6 and has the form traveler set for construction of segment 7.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from the right of Abutment 1 in Nevada.

Left side of the picture – The completed Nevada approach with the temporary pylons for the cable stays constructed on top of Pier 5. At the base of Pier 5, the right Arch rib is visible.

Right side of the picture – The completed Arizona approach with the temporary pylons for the cable stays constructed on top of Pier 14. At the base of Pier 14, the right and left Arch ribs are visible.

Spanning the canyon overhead are the twin cableway cranes.

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Utilizing the cableway crane, Olsen Beal crews access the top of the temporary stay pylons in Arizona to complete erection of the pylon head assembly.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from the existing US93 in Nevada.

The completed Arizona approach is visible with the right and left Arch ribs cantilevered outward from the Arizona Skewback at the base of Pier 14.

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Looking down on the Arch from the roadway deck above Pier 14in Arizona, the right and left Arch ribs project outward over the Colorado River below.

Left side of the picture – The right Arch rib is constructed out to segment 4 and awaits final formwork and concrete placement for segment 5.

Right side of the picture – The left Arch rib is constructed to segment 5 and awaits final formwork and concrete placement for segment 6.  Below segment 5, a placing boom is attached to the Arch in preparation of concrete placement.

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Images from June 2008

Colorado River Bridge...

View of the Pier 5 columns as seen from the existing US93 Hairpin in Nevada. Temporary scaffolding stairs allows access up the column to survey control points. To the left of the base of the scaffolding, the Arch form traveler system can be seen rising above the roadway elevation.

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As seen from the existing US93 Hairpin in Nevada, the left and right Arch ribs project outwards over the CO River. The fully configured form traveler systems are secured to segment NV05 and cantilevers out to form segment NV06.

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Visible from the base of the Hoover Dam, the Arch begins to take shape.

Left side of the picture – Arizona approach spans from Abutment 2 to Pier 14. The Arch projects outward from the Pier 14 skewback footing. Temporary pylons for the cable stay erection system are partially completed on the bridge deck above Pier 14.

Right side of the picture – The completed Nevada approach span from Pier 4 to Pier 5, along with the left and right ribs of the Arch are visible. Above Pier 5, the temporary pylons for the cable stay erection system can be seen.
 

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View of the partially completed 155’ tall temporary pylon at Pier 14. These towers are part of the cable stay erection system that will support the arch ribs until closure.

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The north highline crane system delivers the 6th precast segment to waiting Olsen Beal workers at the top of the temporary pylon on the right at Pier 14.

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Images from May 2008

Interim Surfacing on the Arizona & Nevada Approaches...

View of the completed Nevada approach portion of the project between the Hoover Dam BOR Warehouse Bridge and the Hoover Dam Canyon Bridge.

At the center of the picture, Las Vegas Paving personnel perform clean up work near the Hoover Dam Lower Portal Road Bridge.

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View of the completed Nevada approach portion of the project between the Hoover Dam Canyon Bridge and the Hoover Dam BOR Warehouse Bridge.

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View of the completed Nevada approach portion of the project near the Nevada interchange as seen from the existing US93.

A Las Vegas Paving water truck readies to wash the roadway alignment in preparation for final project acceptance.

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View of the completed Nevada approach portion of the project as seen from the existing US93.

At the bottom left of the picture, the Hoover Dam Canyon Bridge is visible.

Near the top right of the picture, is the Nevada interchange, along with the Goldstrike Canyon Road.

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View of the completed Arizona approach portion of the project as seen from the Sugarloaf Mountain Bridge towards the Arizona Interchange.

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Colorado River Bridge...

Utilizing the highline crane system, Obayashi / PSM, JV workers hoist and prepare to erect the first segment of the 155’ tall temporary pylon at Piers 5 as part of the cable stay erection system that will support the arch ribs until closure.

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Obayashi / PSM, JV workers remove formwork and prepare to advance the form traveler system from the recently constructed left arch rib segment NV05 out to and reset for segment NV06.

Across the canyon, in Arizona, the left and right Arch ribs are visible projecting from the skewback footing, nearly 1000’ away.

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View of the left and right Arch ribs as they project from the Pier 5 skewback footing in Nevada.

Foreground – The left rib is currently constructed out to segment NV05.

Background – The right rib is currently constructed out to segment NV04.

Workers access the form system by the temporary stairs attached to the back of the arch ribs. As the Arch is constructed, additional stairs will be added.

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View of the Nevada approach span of the Mike O'Callaghan-Pat Tillman Memorial Bridge.

From left to right – The left and right ribs of the Arch project from the Pier 5 skewback footing. Piers 5 through 1 are completed along with the bridge deck spanning between them.

At the far right, the two towers of the twin highline crane system can be seen.

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Obayashi / PSM, JV workers perform final checks of the Bidwell concrete finishing machine prior to concrete placement for the deck of Arizona approach from Pier 15 to Abutment 2.

Foreground – A side discharge conveyor system spans across the deck to assist in concrete placement. The conveyor and the finishing system travels towards Abutment 2 while placing the freshly placed concrete.

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View of the Mike O'Callaghan-Pat Tillman Memorial Bridge alignment looking from Arizona towards Nevada.

Left side of the picture – Arizona approach spans from Abutment 2 to Pier 14. Olsen Beal crews install steel stay-in-place decking between the girders prior to deck reinforcement placement. Overhead, the highline crane system delivers materials to the work area.

Right side of the picture – Across the canyon, the completed Nevada approach span from Abutment 1 to Pier 5, along with the left and right ribs of the Arch are visible.

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Preparing for concrete placement, Obayashi / PSM, JV workers assemble the Bidwell concrete finishing machine on the Arizona approach.

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Images from April 2008

Interim Surfacing on the Arizona & Nevada Approaches...

View of the completed pavement on the Arizona approach portion of the project looking towards the Sugar Loaf Mountain Bridge.

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Las Vegas Paving placing the first lift of asphalt pavement on the Nevada approach portion of the project.

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Arizona Highways Safety Systems driving posts for the guard rail in Nevada.

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On the Arizona approach, Arizona Highways Safety Systems install guard rail along the roadway alignment.

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Triple J Trenching constructing the slotted drain systems after the paving is completed on the Arizona approach portion of the project.

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Colorado River Bridge...

View of the bridge alignment looking towards Hoover Dam as seen from downstream of the dam.

Left side of the picture:
Completed Nevada approach span from Abutment 1 to Pier 5. At the bottom of Pier 5, the constructed Arch begins to project outward over the CO River.

Right side of the picture:
the Arizona approach span from Abutment 2 to Pier 14 near completion. At the bottom of Pier 14, the formwork for the Arch segments are visible.

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Nevada approach from Abutment 1 to Pier 5.

At the center of the picture, Obayashi / PSM, JV workers prepare for concrete placement for the bridge deck.

Near the top right, Olsen Beal crews install steel stay-in-place decking prior to deck reinforcement placement.

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Obayashi / PSM, JV workers pre-assemble and attach access platforms to precast temporary pylon towerheads.

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Ariel view of the Nevada approach from Abutment 1 to Pier 5. At the bottom of Pier 5, the form traveler form system is cantilevered from the completed Arch as it projects outward from the skewback.

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Ariel view of the Project alignment looking from Nevada towards Arizona.

In the foreground, the Nevada approach span of the Mike O'Callaghan-Pat Tillman Memorial Bridge is nearing completion. Obayashi / PSM, JV workers prepare for the final concrete pour to complete the bridge deck out to Pier 5.

In the background, the Arizona approach spans of the Mike O'Callaghan-Pat Tillman Memorial Bridge are visible along with the roadway alignment leading up to the bridge.

At the bottom center, the Pedestrian Plaza access ramp zigzags up the mountainside from the future parking lot to allow access to the bridge’s pedestrian walkway.

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View of the Arizona approach from Abutment 2 to Pier 14.

At the center of the picture, Olsen Beal crews install steel stay-in-place decking between the girders prior to deck reinforcement placement.

At the left, the two towers of the twin highline crane system can be seen.

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Ariel view of the bridge alignment looking towards Hoover Dam.

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Images from March 2008

Interim Surfacing on the Arizona & Nevada Approaches...

Las Vegas Paving performing compaction of the asphalt pavement on the Arizona approach portion of the project.

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Las Vegas Paving placing the first lift of asphalt pavement on the Arizona approach portion of the project.

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Colorado River Bridge...

In Arizona, pre-assembled Arch reinforcing steel cages are stockpiled and await placement as part of an Arch segment.

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View of underside of bridge spans 1 and 2 as seen from the existing US93 hairpin in Nevada.

Working approximately 95’ above the ground, an Obayashi / PSM, JV worker attaches the temporary orange overhang falsework brackets to the outside of the steel girder of span 2.

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View of spans 3 and 4 as seen from the deck of the bridge.

In the foreground, Obayashi / PSM, JV workers survey grade and adjust the overhang falsework brackets on the outside of the steel girder of span 2.

In the background, Olsen Beal crews place stay in-place decking for bridge span 3, between piers 3 and 4.

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Utilizing the south cableway crane system, Olsen Beal crews transport and place steel stay in-place decking for bridge span 3, between piers 3 and 4. Hanging on temporary supports between the girders, the bridge deck drain piping system can be seen.

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View of the bridge alignment, looking from Nevada towards Arizona.

In the foreground, crews from Steel Engineers place reinforcing steel for the deck of span 1, between Abutment 1 and Pier 1.

In the background, Olsen Beal crews place stay in-place decking for bridge span 3, between piers 3 and 4.

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View of the bridge alignment from the existing US93 hairpin in Nevada looking towards Arizona.

In the foreground, Obayashi / PSM, JV workers place concrete for Arch segment NV04-Left

In the background, across the Colorado River, the Arizona Arch segments, along with Pier 14 columns are visible, approximately 1100’ away.

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As seen from the existing US93 hairpin in Nevada, during a night shift operation, a concrete pump truck delivers concrete to Obayashi / PSM, JV workers for placement at Arch segment NV04-Left.

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View of a pre-assembled reinforcing steel cage being delivered to Arch segment NV03-Right from the Abutment 2 area in Arizona. This 25’ long cage weighs approximately 32,000 pounds and is delivered across the canyon with the south cableway crane system.

Visible just below the cage is the trolley assembly of the north cableway crane system.

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Images from February 2008

Interim Surfacing on the Arizona & Nevada Approaches...

View of the Arizona approach roadway prior to aggregate base placement. On ramp B, near the Arizona interchange, Triple J Trenching is visible excavating and installing conduits for future electrical crossings.

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Triple J Trenching crews place and compact backfill material for installation of conduits for future electrical crossings on the Arizona approach.

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On the Nevada approach, Las Vegas Paving is hauling, placing, and compacting aggregate base material onto the Nevada approach roadway alignment near the Nevada interchange.

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View of a haul truck placing aggregate base material onto the Nevada approach roadway alignment near the Hoover Dam Canyon Bridge.

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Las Vegas Paving shaping aggregate base material prior to compacting on the Nevada approach roadway alignment.

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Colorado River Bridge...

The final span 2 steel girder is being transported from the abutment 1 area for placement in span 2. This girder is approximately 100’ long and weighs 45 tons.

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Olsen Beal crews prepare cable rigging for hoisting and erecting steel girders for the Nevada approach.

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Delivery of the steel girders for the Nevada approach.

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from abutment 1 in Nevada.

Steel girders for span 1 are erected with 3 of the 4 placed for span 2.

Olsen Beal crews are transported in a man basket to pier cap 3 in preparation for erection of the final girder for span 2.

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View of the Nevada approach columns with steel girders in span 2 erected along with 2 of the 4 girders erected in span 3.

At the bottom of Pier 5, the completed Arch is visible cantilevered off of the NV skewback footing.
 

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from downstream of Hoover Dam.

At the left, the Nevada approach columns (Piers 1, 2, 3, 4, & 5) are visible with steel girders in-place for spans 1, 2, and 3. Near the bottom of Pier 5, newly constructed Arch segments cantilever off of the NV skewback footing.

To the right, the Arizona approach columns (Piers 14 & 15) can bee seen with the girder placement completed. Below Pier 14, on the AZ skewback, formwork cantilevers off of the footing.

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Images from January 2008

Colorado River Bridge...

Olsen Beal crews look on as the North highline crane hoists a 50 ton concrete certification weight.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from abutment 1 in Nevada.

Center – The completed Pier 1 cap is awaiting steel girder placement. System scaffolding encases the right column of Pier 1.

Above the pier cap, the North highline crane is being certified prior to use with a 50 ton concrete block test load.
 

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from abutment 1 in Nevada. Both operational highline cranes can be seen in their fully constructed configuration.

Near the bottom of the photograph, piers caps for Piers 1, 2, 3, and 4 are visible.
 

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View of the CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) progress as seen from downstream of Hoover Dam.

At the left, the Nevada approach columns (Piers 1, 2, 3, 4, & 5) are visible awaiting steel girder placement.

To the right, the Arizona approach columns (Piers 14 & 15) can bee seen with the girder placement nearing completion.

Spanning the canyon above the Approaches, the 3” track cables of the highline cranes are visible.

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The 50 ton concrete block test load traverses the canyon via the north highline crane.

At the left of the photograph, the Arizona approach is visible.

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Crews from Steel Engineers assembling arch reinforcing steel in a template on the Arizona approach.

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Obayashi / PSM, JV field engineer performs construction surveying from the existing US93 near the Nevada hairpin area.

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View of the assembled precast temporary stay cable towerhead. These towerheads will be constructed on top of a 130’ tall temporary tower at Piers 5 and 14 as part of the cable stay erection system that will support the arches until closure. At the completion of arch construction, they will be removed along with the temporary stay cables.

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Images from December 2007

Colorado River Bridge...

View of the Nevada approach columns of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from the existing US93 in Arizona.

From left to right:
In Arizona - Olsen Beal crews utilize a Manitowoc 2250 crane to assemble the trolley and attach the slack carriers for the highline crane system

Piers 5, 4, 3, 2, 1 - columns are complete with their pier cap visible above the cap falsework.

Abutment 1 – can be seen to the far right.

In Nevada - Olsen Beal crews utilize a Manitowoc M250 crane to perform work on the Nevada side of the highline crane system.

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At the NV skewback footing, Obayashi / PSM, JV crews assemble the form traveler to its full configuration onto the left Arch rib in preparation for construction of the third segment.

To the right of this picture, an additional crew assembles formwork in preparation for construction of right Arch rib segment two.

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High above the roadway alignment in Nevada, Olsen Beal crews continue construction of the new highline crane systems.

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Utilizing a Manitowoc M250 crane located in the abutment 1 area in Nevada; Olsen Beal crews attach the slack carriers onto the 3” cables of the South highline crane system.

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In Arizona, steel girders make up a reinforcing steel fabrication jig. On the exterior of this jig, iron workers will assemble Arch segment reinforcing steel cages. Once complete, the cages will be lifted off of the end of this jig and transported out to the form traveler and placed as part of an Arch segment.

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In Arizona, high above the roadway alignment at Abutment 2, Olsen Beal crews construct the highline crane system by attaching the trolley and slack carriers to the 3” cables that span the canyon.

Below Pier 14, on the AZ skewback, formwork cantilevers off of the footing in preparation for an arch segment concrete placement.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from downstream of Hoover Dam.

At the left, the Nevada approach columns (Piers 1, 2, 3, 4, & 5) are visible awaiting steel girder placement. Near the bottom of Pier 5, newly constructed Arch segments cantilever off of the NV skewback footing.

To the right, the Arizona approach columns (Piers 14 & 15) can bee seen with the girder placement completed.

The towers of the new highline crane system can bee seen to the edge of the picture, along with their 3” cables spanning the canyon between them.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from upstream of Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right.

Steel girders are in-place for the approach spans in Arizona while crews construct the new highline crane system.

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Images from November 2007

Colorado River Bridge...

In the contractor’s laydown yard, Obayashi / PSM, JV crews prepare formwork to cast concrete panels for the exterior of the Arch strut steel frames. A completed panel is hoisted by crane and transported to the staging area, awaiting erection.

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In Nevada, Olsen Beal crews reeve cabling through an 18 part block and tackle system for the backstay cable of the south highline crane system.

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Nicholson Construction continue to drill through pipe sleeves and nearly 60’ into solid rock to install post tensioning strand for the Arizona left temporary backstay anchor block.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) alignment as seen from the existing US93 hairpin in Nevada.

Piers 4, 3, 2, 1 - columns are complete with their pier cap visible above the cap falsework.

Abutment 1 – can be seen to the far right. Beyond Abutment 1, projects the towers of the twin highline crane systems. Viewable high above the pier caps, the 3” diameter track cables for the new highline system span the canyon between the Nevada and Arizona highline towers.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

In the foreground, steel girders span between Abutment 2 to Pier 15, then from Pier 15 to Pier 14.

Across the canyon, the two white towers of the twin highline crane systems can be seen in Nevada.

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View of half of the lower support structure of the form traveler system as it is being prepared for installation onto the left Arch rib in Nevada. This support structure forms the bottom of the Arch segment while concrete is placed.

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In Nevada, Olsen Beal crews reeve cabling through an 18 part block and tackle system for the backstay cable of the south highline crane system.

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Utilizing a Manitowoc 2250 crane located in the abutment 2 area in Arizona; Olsen Beal crews continue assembling the new highline crane system.
 

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Images from September & October 2007

Colorado River Bridge...

Utilizing a Manitowoc 2250 crane located in the abutment 2 area in Arizona; Olsen Beal crews disassemble and prepare the S-70 Derrick Crane for removal and demobilization.

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View of the new slack carriers awaiting installation on the highline crane system.

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View of the completed Nevada towers for the new highline crane system located at the abutment 1 area in Nevada. These towers are 335’ tall.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

At the right of the picture, red temporary bracing project out from span 15 to form the deck overhang.

Across the canyon, a Manitowoc 2250 crane located at the Nevada hairpin on existing US93 delivers materials and workers to the top of Pier 5. Visible beyond it are the columns of the Nevada approach and new highline crane towers.

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View of the Nevada approach columns as seen from the crest of Hoover Dam.

From left to right:

 Pier 5 – At the top, Obayashi / PSM, JV personnel stress the pier cap transverse post tensioning.  At the bottom, formwork projects outward from the skewback footing, forming the first two segments of the Arch.

 Piers 4, 3, 2, 1 - columns are complete with their pier cap visible above the cap falsework.

 Abutment 1 – can be seen to the far right.  Beyond Abutment 1, projects the tops of the twin highline crane systems.

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Images from August 2007

Colorado River Bridge...

View of the erected steel girders for spans 15 and 16 as seen from Abutment 2 in Arizona. The bridge deck elevation will be approximately 9” above the girders top flange. In the background, Olsen Beal erects the Nevada towers for the new highline crane system.

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Obayashi / PSM, JV crews continue to construct overhang brackets and formwork onto the edge of the span 16 girder.

Across the canyon, in the abutment 1 area in Nevada, Olsen Beal crews erect the Nevada towers for the new highline crane system. To the right of this picture, the Manitowoc 2250 crane located at the Nevada hairpin on existing US93 is stored in it’s laid down, non-use configuration.

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View of the Nevada approach columns of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from the existing US93 in Arizona.

From left to right:
Pier 5 – System scaffolding encases the right column for concrete finishing operations. At the bottom of Pier 5, formwork projects outward from the skewback footing, forming the first two segments of the Arch.
Piers 4, 3, 2, 1 - columns are complete with their pier cap visible above the cap falsework.
Abutment 1 – can be seen to the far right.

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Utilizing a Manitowoc M250 crane located in the abutment 1 area in Nevada; Olsen Beal crews erect the Nevada towers for the new highline crane system. The one on the left is currently 240’ while the one on the right is 160’ tall. When completed these towers will top out at 335’ in height.

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Obayashi / PSM, JV utilizing the S-70 Derrick Crane at Abutment 2 in Arizona to remove the temporary bracing between piers 14 and 15 through an opening in the steel girder alignment. Once complete, the final girder of span 15 will be set.

At the bottom left of this picture, crews continue to form the foundation blocks of the Arizona towers for the new highline crane system.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

In the foreground, at the abutment 2 area, work continues on construction of the foundation blocks of the Arizona towers for the new highline crane system, along with the completion of girder erection for spans 15 and 16.

Across the canyon, a Manitowoc 2250 crane located at the Nevada hairpin on existing US93 delivers materials and workers to the top of Pier 5. Visible beyond it are the columns of the Nevada approach.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from downstream of Hoover Dam.

At the left, the Nevada approach columns (Piers 1, 2, 3, 4, & 5) are visible awaiting steel girder placement.

To the right, the Arizona approach columns (Piers 14 & 15) can bee seen with the girder placement nearing completion.

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Images from July 2007

Colorado River Bridge...

View of new stockpiled Cableway Crane cables located on the Nevada approach awaiting erection.

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Nicholson Construction utilizing a Manitowoc M250 crane to transport drilling equipment and materials to the location of the luffing guy anchor block for the new Cableway Crane system near the Abutment 1 area.

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Utilizing the Manitowoc 2250 crane located at the Nevada hairpin on existing US93, Olsen Beal crews construct falsework for the Pier 5 cap. Workers walk the steel beams situated 860’ above the Colorado River.

System scaffolding encases the columns of Pier 5 to allow access for grouting and concrete finishing operations.

To the right of Pier 5, Pier 4 can be seen.

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Obayashi / PSM, JV utilizing the S-70 Derrick Crane and a yellow man basket at Abutment 2 in Arizona to access the Pier 14 skewback footing where crews continue to form Arch segments.

Above the man basket, the formwork for Pier 14 pier cap can be seen. Concrete placement for this cap took place during the night time hours on July 20, 2007.

To the left of Pier 14, completed Pier 15 along with its cap can be seen.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from Arizona, looking towards Nevada.

Across the canyon, a Manitowoc 2250 crane delivers materials and workers to the top of Pier 5. At the bottom of Pier 5, formwork projects outward from the skewback footing, forming the first two segments of the Arch. The blue formwork is the inner core of the Arch form traveler system. This system will be utilized to form the hollow inner portion of the Arch.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) as seen from the existing US93 hairpin in Nevada. From left to right:

Pier 5 – system scaffolding encases the columns for grouting and concrete finishing operations. At the pier cap, carpenters continue to set falsework.

Piers 4, 3, 2, 1 - columns are complete with their pier cap visible above the cap falsework.

Abutment 1 – can be seen to the far right.

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Images from June 2007

Colorado River Bridge...

Olsen Beal crews erecting precast segments for Pier 14 left column.

Visible to the right and left are the completed columns of Pier 15.

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View of the formwork for the Pier 15 cap, ready for concrete placement.

In the background, visible between Pier 15 columns, Olsen Beal crews continue erecting precast segments for Pier 14 left.

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View of Piers 14 and 15 as seen from the crest of the Hoover Dam.

Olsen Beal crews utilizing the S-70 Derrick crane at Abutment 2 in Arizona to transport precast segments and erect Pier 14 left column.

To the left of Pier 14, the completed columns of Pier 15 along with the formwork for the cap can be seen.

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Olsen Beal utilizing the Manitowoc 2250 crane located at the Nevada hairpin on existing US93 to erect precast segments for Pier 5 left column.

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View of precast column segments, delivered to the Abutment 2 area, in preparation for transport to their respective columns by the S-70 Derrick crane.

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View of the bridge alignment as seen from the crest of the Hoover Dam.

Piers 15 and 14 appear to the left in this picture, while Pier 5, 4, 3, 2, 1 appear to the right.

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View of the delivered steel box girders, staged at the Abutment 2 area.

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Obayashi / PSM, JV continuing to assemble the inner core form of the Arch form traveler system. This system will be utilized to form the hollow inner portion of the Arch.

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Subcontractor, Nicholson, drilling holes for the rock anchors of the new highline back stay anchor located in Arizona near abutment 2.

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Images from May 2007

Colorado River Bridge...

Olsen Beal utilizing the S-70 Derrick crane at Abutment 2 in Arizona to transport precast segments and erect Pier 14 right column.

Visible above Pier 14 is the completed columns of Pier 15.

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Olsen Beal utilizing the Manitowoc 2250 crane located at the Nevada hairpin on existing US93 to erect precast segments for Pier 5 right column.

Visible to the right of Pier 5 is the completed columns of Pier 4.

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View of the South temporary stay cable anchor block located in Arizona near Abutment 2.

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View of the bridge alignment at abutment 1.

From left to the right –
Completed Pier 2 can be seen with the formwork removed from its pier cap. Pier 1 has the falsework in place waiting for reinforcing steel / formwork to construct the pier cap. The temporary stay cable anchor blocks are visible in the roadway alignment to the right of the abutment. Near the yellow Grove crane, the old Highline Crane tower foundations are being prepared for removal by blasting.

To the left of the temporary stay cable anchor blocks, the Pedestrian Access ramp zigzags up the mountainside from the future access parking lot where the construction office trailers are currently located.

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View of the bridge alignment looking towards Hoover Dam.

Left side of the picture –
Completed Pier 2, 3, and 4. Pier 5 right / left columns are in various stages of erection. Falsework for the Arch cantilevered off of the Pier 5 skewback footing.

Right side of the picture –
Falsework for the Arch cantilevered off of the Pier 14 skewback footing. Pier 14 right / left columns are in various stages of erection. The S-70 Derrick crane is setting precast segments for the Pier 15 left column from Abutment 2. Pier 15 right column is competed.

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View of the bridge alignment looking from Abutment 2 (Arizona) towards Abutment 1 (Nevada).

Foreground: completed Pier 15 columns are wrapped in scaffolding.

Background: Falsework for the Arch is cantilevered off of the Pier 5 skewback footing. Above the falsework, Pier 5 can be seen with crew erecting segments for the right column. Pier 4 is visible with the pier cap falsework in place.

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Looking down at Pier 5 skewback footing on completed Arch segments NV01 Right and Left. The falsework for segments 2 projects out over the canyon, ready for formwork / reinforcing steel placement.

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View of the bridge alignment looking from Abutment 2 (Arizona) towards Abutment 1 (Nevada) from above Abutment 2.

Foreground: Excavations for the temporary stay cable anchor blocks are visible in the roadway alignment near the footing of the S-70 Derrick crane. The crane is currently setting precast segments for the erection of Pier 15 left column.

Background: Pier 5 and the Arch segments in various stages of construction. Next are the completed Pier 4, 3, 2. Pier 1 that can be seen with the falsework in place for the pier cap construction. Abutment 1 is visible behind Pier 1.

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Looking down on Olsen Beal crews preparing to set the next precast segment at Pier 5 right as they work 230 feet above the skewback footing.

Visible below are the completed Arch segments NV01 Right and Left along with the falsework for segments 2.

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Images from April 2007

Colorado River Bridge...

Olsen Beal utilizing the S-70 Derrick Crane at Abutment 2 in Arizona to transport precast segments and erect Pier 15 right and left columns.

Visible below Pier 15 is the skewback footing of Pier 14 with the falsework for the Arch protruding outward.

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View of the South temporary stay cable anchor block located in Nevada near Abutment 1.

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View of delivered concrete being cooled with liquid Nitrogen prior to placement for construction of the Arch segment NV01-RT.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) alignment as seen from the existing US93 hairpin in Nevada.

Abutment 1 in final stages of construction with the blockouts for the tie back anchors remaining to be filled.

Pier 1 is shown with falsework for the pier cap in place.
Pier 2 can be seen with the completed pier cap.
Pier 3 is visible with the completed pier cap along with climbing scaffolding surrounding the columns.
Pier 4 is visible with the completed pier cap.

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Images from March 2007

Colorado River Bridge...

Workers from Jake’s Crane prepare for the removal of the counter weights from the Link Belt TG1900 erected on the Pier 15 left foundation.  This worker is attaching hoisting slings onto the weights wile perched nearly 865’ above the Colorado River.
 

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Obayashi / PSM, JV utilizing a Manitowoc 2250 crane to construct / access Piers 3 and 4 from the Nevada hairpin on existing US93.

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View of the bridge alignment as seen from Arizona towards Nevada.

Piers 1, 2, 3, 4, 5 in various stages of completion.  Formwork for Arch segments NV01N and NV01S can be seen cantilevered off of the Pier 5 (NV skewback) footing.

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Jake’s Crane utilizing the S-70 Derrick Crane at Abutment 2 in Arizona to dismantle the Link Belt TG1900 from the Pier 15 left foundation.

Visible to the left of the crane is Pier 15 right in partial stage of completion.

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Crane close-up.
 

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Workers from Jake’s Crane utilizing the S-70 Derrick Crane at Abutment 2 in Arizona to dismantle the Link Belt TG1900 from the Pier 15 left foundation.  Crews are removing the boom section and transporting it to the laydown area on the Arizona approach roadway.

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) alignment as seen from Nevada, looking towards Arizona.

Abutment 1 in final stages of construction with the blockouts for the tie back anchors remaining to be filled.

Pier 1 is shown with falsework for the pier cap in place.

Pier 2 can be seen with formwork for the pier cap in place.  Concrete placement for the cap was performed on August 21, 2006.

Pier 3 is visible with formwork for the pier cap in place.  Concrete placement for the cap was performed on March 27^th.

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Images from February 2007

Colorado River Bridge...

Dielco Crane assembles and attaches the luffing jib to the Manitowoc 2250 crane at the existing US93 near the hairpin in Nevada.
 

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Dielco Crane assembling a Manitowoc 2250 crane to be utilized at the existing US93 near the hairpin in Nevada.

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Obayashi / PSM, JV personnel constructing falsework for the Pier 4 pier cap in the work access area of the existing US93 near the hairpin in Nevada.

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Obayashi / PSM, JV and Olsen Beal personnel assembling the 70 foot mast for the S-70 Derrick Crane near Abutment 2 in Arizona.

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Obayashi / PSM, JV and Olsen Beal prepare to raise and install the 70 foot mast for the S-70 Derrick Crane near Abutment 2 in Arizona.
 

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View of the future CO River Bridge (Mike O'Callaghan-Pat Tillman Memorial Bridge) alignment as seen from Nevada, looking towards Arizona. Visible to the lower left of this photograph is the nearly completed pedestrian access ramp as it zigzags up the mountain side onto the alignment near Abutment 1.

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View of the bridge alignment as seen from downstream of the Hoover Dam.

Left Center: Piers 1, 2, 3, 4, 5 in various stages of completion. Formwork for Arch segments NV01N and NV01S can be seen cantilevered off of the Pier 5 (NV skewback) footing.

Right Center: Pier 14 (AZ skewback) footing, Pier 15, and abutment 2 are visible. The Link Belt TG1900 Tower Crane remains erected on the left footing foundation of Pier 15.

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Ladd & Associates place back fill material at Abutment 1 in Nevada.

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Obayashi / PSM, JV utilizing a Manitowoc 2250 crane to construct / access Piers 3 and 4 from the Nevada hairpin on existing US93.
 

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Subcontractor, Nicholson, drilling holes for the rock anchors on the north temporary backstay anchor block in Nevada near abutment 1.

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Images from January 2007

Colorado River Bridge...

Obayashi / PSM, JV personnel stockpiling system scaffolding materials in the work access area of the existing US93 near the hairpin in Nevada.
 

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View of the S-70 Derrick Crane bracing to be erected near Abutment 2 in Arizona. This crane will be utilized to erect Piers 14 and 15 and construct portions of the Arch from the Arizona side of the canyon.

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Obayashi / PSM, JV crews place concrete to construct the south Back Stay Anchor block near Abutment 1 in Nevada.
 

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Obayashi / PSM, JV utilizing a Grove GMK6350 truck crane to remove system scaffolding from Pier 2 left.

From left to right appear Pier 4 left with system scaffolding erected around its column, Pier 3 has climbing scaffolding attached to allow access for grouting / finishing operations, Pier 2 is currently having the system scaffolding removed. Behind Pier 2, Pier 1 and Abutment 1 can be seen.

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Images from November/December 2006

Colorado River Bridge...

View of the bridge alignment looking from Abutment 2 (Arizona) towards Abutment 1 (Nevada).

Foreground: Reinforcing steel for the Abutment 2 backwall protrudes upwards. Further out, Pier 15 Right in the current erection stage while the Link Belt TG1900 tower crane remains erected on Pier 15 Left footing.

Background: Pier 5 is in the erection stage. Behind Pier 5, Pier 4 is visible with the pier cap falsework in place.
 

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View of Nevada Approach piers as seen from the Colorado River elevation just downstream of the Hoover Dam. Visible from the left to the right are Piers 1 through 5. The formwork for the arch starter segments is cantilevered off of the Pier 5 skewback footing, protruding out over the canyon wall. Temporary bracing spans between Piers 2 to Pier 4. Once Pier 5 is erected to the temporary bracing elevation, additional sections will be set to connect to Pier 4.

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Obayashi / PSM, JV and Cross Marine Projects utilizing a crane and dive team to remove fallen Cableway Crane System debris from the Colorado River. Crews were staged at the river’s edge on top of the Hoover Dams’ Nevada spillway tunnel structure.
 

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View of Arizona Approach as seen from the existing US93 near the hairpin in Nevada.

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Obayashi / PSM, JV utilizing a Grove GMK6350 truck crane to access Piers 3 through 5 from the existing US93 at the hairpin turn in Nevada. From left to right appear Pier 4 with its pier cap falsework partially constructed, Pier 3 has climbing scaffolding attached to allow access for grouting / finishing operations, and Pier 2 has system scaffolding erected around its columns to allow access to the pier cap. Behind Pier 2, Pier 1 and Abutment 1 can be seen.

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View of Hoover Dam and Nevada Approach as seen from the Hoover Dam visitor parking area in Arizona.

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Images from October 2006

Colorado River Bridge...

Obayashi / PSM, JV personnel loading the last segments of the collapsed South Cableway Crane towers at the Abutment 1 area in Nevada.

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Obayashi / PSM, JV personnel are utilizing a crane to access Pier 4 to remove a temporary protection beam from the side of the columns.

To the right of Pier 4, visible is Pier 3 with access scaffolding projecting up from the ground.

Behind Pier 3, Pier 2 can be seen with its completed pier cap in place.

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looking east

View of Abutment 1 with backfilling operation nearing completion.

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Ladd & Associates utilizing hoppers to transport backfill material for the backfilling of Abutment 2. 

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View of the approach spans looking from Pier 5 to Abutment 1 as seen from the Nevada hairpin on existing US93.

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Images from September 2006

Colorado River Bridge...

View of the collapsed North and South Cableway Crane system looking from Nevada towards Arizona.

 

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View of the collapsed North and South Cableway Crane system at Abutment 2 area in Arizona.
 

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Images from August 2006

Colorado River Bridge...

Pictured from left to right:
Abutment 1 in final stages of construction.
Pier 1 is shown with falsework for the pier cap in place.
Pier 2 is shown with pier cap formwork in place ready for concrete placement.
Pier 3 is shown with falsework for the pier cap in place.
Pier 4 is in the erection stage awaiting falsework for the pier cap.
Pier 5 right is in the erection stage
 

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From the bottom to the top:
Pier 14 Skewback footing is complete. On the temporary work platform, Nicholson Construction is drilling for the temporary tie back anchors through the footing into the canyon wall.

A Link Belt TG1900 tower crane is erected on Pier 15 left footing. Pier 15 right is in its initial stages of erection with several segments placed.

The formwork for Abutment 2 appears near the center of this picture.
 

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Visible is the formwork for the Arch starter segments attached to the Pier 5 Skewback footing. Above the footing, crews on Pier 5 continue to erect precast segments. All of the precast segments for Piers 1 through 4 have been erected and the pier caps are in various stages of construction. Grey colored temporary bracing can been seen attached between Pier 4 and Pier 3 and between Pier 3 and Pier 2. Overhead, the cableway cranes provide personnel access and material deliveries to the pier columns.
 

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Ladd & Associates in the process of backfilling the Abutment 1. Projecting on an angle through the right retaining wall and the abutment are the tie back anchors. Visible through Abutment 1 backwall reinforcing steel is the falsework for the Pier 1 pier cap and the formwork for the Pier 2 pier cap.
 

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View of the Abutment 2 stem wall in preparation for concrete placement after formwork and reinforcing steel have been constructed.
 

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View of the approach spans looking from Pier 4 to Abutment 1 as seen from the Nevada hairpin on existing US93.
 

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Images from July 2006

Colorado River Bridge...

View of the Colorado River Bridge alignment looking from Nevada towards Arizona. Pictured from left to right:

Abutment 1 in final stages of construction. Formwork for panels 1 and 3 of the nearly 57’ tall retaining wall being placed.
Pier 1 is shown with falsework for the pier cap in place.
Pier 2 is shown with falsework for the pier cap in place.
Pier 3 is in the erection stage.
Pier 4 is in the erection stage awaiting temporary wind bracing placement.

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Obayashi / PSM, JV personnel placing concrete for the Pier 14 footing (Arizona skewback). Nearly 2200 cubic yards of concrete was placed, all of which was pumped though the twin 700’ long pipes (slick line) extending from the Abutment 2 area into Pier 14 which can be seen bolted to the excavation wall.

Reinforcing steel for the South arch is visible extending out of the face of the formwork.
 

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Obayashi / PSM, JV personnel placing concrete for the Pier 14 footing (Arizona skewback). Two 32 meter concrete placing booms were utilized to accurately distribute the concrete into the formwork.

Reinforcing steel for the North arch is visible extending out of the face of the formwork.

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Obayashi / PSM, JV personnel working late into the night placing concrete for the Pier 14 footing (Arizona skewback).

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View of the Nevada approach columns looking from Pier 4 to Abutment 1.

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At the Liquid Nitrogen (LN2) cooling station, Liquid Nitrogen is being injected into concrete mixer trucks to cool the freshly batched concrete.

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Olsen Beal utilizing the two cableway cranes in tandem to erect the temporary bracing between Pier 2 and 3.

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Images from June 2006

Colorado River Bridge...

View of the Colorado River Bridge alignment looking from Nevada towards Arizona. Pictured from left to right:

Abutment 1 in final stages of construction. Formwork for the second lift on the retaining wall being placed.

Pier 1 is shown with falsework for the pier cap in place.

Pier 2 is erected to pier cap elevation.

Pier 3 is in the erection stage awaiting temporary wind bracing placement.

Pier 4 right, Olsen Beal crews utilizing the cableway crane to set a precast segment.

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View of the bridge alignment looking towards the Arizona side of the canyon. From the bottom to the top:

Pier 14 Skewback footing formwork is completed awaiting concrete placement. As seen to the right of the excavation, twin 700’ long pipes (slick line) extend from the Abutment 2 area into Pier 14 for placement of concrete by pumping.

A Link Belt TG1900 tower crane is erected on Pier 15 left footing.

The formwork for Abutment 2 appears near the center of this picture.

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Precast column segments staged near abutment 1 awaiting placement for the approach span columns.

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Left: Olsen Beal personnel utilizing the cableway crane to set another segment for the Pier 4 right column.

Center: Crews from Jake’s Crane dismantling the Link Belt TG1900 tower crane erected on Pier 4 left footing.

Right: Temporary scaffolding is attached to the sides of Pier 3 left column to provide access during final stages of erection. This scaffolding is utilized during segment erection and subsequent post tensioning bar grouting operations.

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View of the approach spans looking from Pier 3 to Abutment 1.

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View of the approach spans looking from Pier 3 to Abutment 1.

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Close up view of Olsen Beal personnel setting a precast segment for the Pier 4 right column.

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The bridge alignment looking from Arizona straight towards the Nevada approach spans. Pictured from bottom to top.

Nicholson Construction drilling for the temporary tie back anchors through the Pier 5 Skewback footing into the canyon wall. Crews on Pier 4 right erecting precast segments. The cableway crane lowering the next segment for placement is visible. Temporary scaffolding can been seen attached to Pier 3 left. Pier 2 is completed up to pier cap elevation. Behind pier 2, barely visible is the scaffolding on Pier 1 and the partially constructed Abutment 1.

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Images from May 2006

Colorado River Bridge...

Harris Rebar personnel placing reinforcing steel for the Pier 14 footing (Arizona skewback). Visible along the excavation walls are rock bolts installed to provide slope stability.

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Harris Rebar personnel placing reinforcing steel for the Pier 14 footing (Arizona skewback).

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View of the excavation and formwork reinforcing steel placement for the Pier 14 footing (Arizona skewback).

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Obayashi / PSM, JV nearing completion of casting precast column segments at the precast yard located near Boulder City, Nevada.

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View of the excavation and formwork placement at Abutment 2.

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Another view of the excavation and formwork placement at Abutment 2.

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Lower Center: Olsen Beal erecting precast segments to construct Pier 1 left.
Lower Center Background: Formwork can be seen for Abutment 1.
Lower Foreground: Temporary scaffolding hangs from the sides of Pier 2 Right and Left columns. This scaffolding is utilized during segment erection and subsequent post tensioning bar grouting operations.

Obayashi / PSM, JV carpenters constructing falsework / formwork for the cast-in-place pier caps.

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View of the bridge alignment looking at the Nevada approach spans. Depicted near the center left are the partially constructed Abutment 1, completed Pier 1 right column, partially completed Pier 2 right, Pier 3, and Pier 4 right columns. At the lower center of this view is the completed Pier 5 Skewback footing just below the existing US93 roadway alignment.

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View of the Colorado River Bridge alignment looking from Nevada towards Arizona. Near the lower left, the excavation for the future Pedestrian Plaza access trail leading to Abutment 1 zigzags up from the future parking lot area .

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Aerial view of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Shown at the bottom center of this picture is the competed excavation for Pier 14 (Arizona skewback).

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Images from April 2006

Colorado River Bridge...

View of the installed rock anchors of the excavated backwall of Pier 14 (Arizona Skewback) taken from the footing elevation, looking up. The top of this ¼:1 excavated face is 146’ above the footing elevation.

At the right of this picture is the temporary ladder system in the process of being constructed and bolted to the excavated wall.

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Lower Center: Formwork and reinforcing steel of the Pier 5 Skewback footing.
Center: Erected precast segments of Piers 1, 2, and 3 right columns in various stages of construction.
Upper Center: Formwork and reinforcing steel of partially constructed Abutment 1.
Top: View of the cableway crane systems. The South cableway (left) is completed while the North (right) is in the process of being constructed. Visible to the left of the tower crane at the lower center of the picture is the second 3” cable coming across the canyon.

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Rock excavation for Abutment 2 completed .

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Obayashi / PSM, JV completing formwork for the Pier 5 Skewback footing.

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View of the installed rock anchors of the excavated faces of Pier 14 (Arizona Skewback).
Right: A temporary ladder system is in the process of being constructed and bolted to the excavated wall to allow personnel access to the footing.
Lower Left: Work crews take a lunch break and sit on the excavation floor.

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Obayashi / PSM, JV utilizing two 58 meter pump trucks to place 2,030 cubic yards of concrete, supplied by Casino Ready Mix, for the Pier 5 Skewback footing. Placement operations were staged on the existing US-93 and began at 6:30PM, finishing at 3:30PM the following afternoon.

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View of the concrete placement operation for the Pier 5 Skewback footing.

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Images from March 2006

Colorado River Bridge...

Olsen Beal personnel rigging the precast segment lifting jib onto a segment in preparation for lifting it over the canyon for placement.

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View of a precast segment being unloaded off of a transport trailer in Nevada near Abutment 1.

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Olsen Beal working on construction of the North cableway crane in Nevada. These temporary towers rise 330’ above the future roadway elevation.

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Ladd & Associates excavating for the Pedestrian Plaza access trail leading from the future parking lot to Abutment 1.

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View of the Pier 5 Skewback formwork and reinforcing steel looking down from the existing US-93 roadway elevation. The Colorado River flows approximately 650 feet below the excavated ledge on which the Skewback footing is being constructed.

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Olsen Beal constructing the North cableway crane in Arizona.

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Lower Center: Formwork and reinforcing steel of the Pier 5 Skewback
 footing in preparation for concrete placement.
Center: Olsen Beal erecting segments at Pier 2 right column.
Upper Center: Formwork and reinforcing steel of partially constructed
Abutment 1.
Top: – View of the cableway crane systems.

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Images from February 2006

Colorado River Bridge...

Olsen Beal utilizing the cableway crane to transport and lower a precast segment section for Pier 3 right where it will be attached to the sections below.

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View of the roadway alignment and two cableway cranes at Abutment 2 in Arizona.

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Lower Left: Ladd & Associates drilling holes for the tie back anchors at Abutment 1. Behind the drill rig is the Abutment stem wall under construction.
Lower Center: Visible below the tower crane are the stacked precast pier segments for Pier 2 Right.
Upper Center Right: Completed excavation of Pier 14 (Arizona Skewback). A Caterpillar 320C Trackhoe rests on the excavation floor, approximately 600 feet above the waters of the Colorado River below.

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Top right: View of the partially constructed Abutment 1.
Upper Center: View of the erected precast segments of Pier 2 right column. Visible to the right of this is the footing of Pier 2 left.
Lower Left: Olsen Beal utilizing the two cableway crane to transport and lower a precast segment section for Pier 3 right. Construction personnel stand on the footing of Pier 3 left viewing the operation.

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View of an 80 foot wide preassembled reinforcing steel mat being transported across the river by the cableway crane from the Abutment 2 area to the Pier 5 Skewback where it will be placed for construction of the footing.

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Paradise Steel personnel direct an 80 foot wide preassembled reinforcing steel mat for Pier 5 footing into position as it is being lowered by the cableway crane.

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Images from January 2006

Colorado River Bridge...

View of the bridge alignment looking towards Abutment 1 (Nevada).
Lower Center: Footings of Pier 2 left and right.
Center: Stained Shotcrete constructed for stabilization of the existing rock. To the left of the Shotcrete are the footings of Pier 1 left and right.
Upper Left: The temporary towers of the cableway crane. Near the bottom of these towers, reinforcing steel projects upwards for Abutment 1.

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Overall view of Obayashi / PSM, JV personnel constructing formwork for the footings of Pier 3 left and right.

Near the lower left, a shadow of a man basket appears on the canyon wall. This picture was taken from this man basket as it was suspended nearly 700 feet above the Colorado River by the Link Belt TG1900 Tower Crane erected on Pier 4’s left foundation.

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Obayashi / PSM, JV personnel constructing formwork and reinforcing steel for the footings of Pier 3 left and right. Shown in the top left of this picture are rock anchors installed in the excavation walls.

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Another photo of Obayashi / PSM, JV personnel constructing formwork and reinforcing steel for the footings of Pier 3 left and right.  To the top left of this picture are the corrosion protection covers of the installed rock anchors in the excavation walls.

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Top Right: The Link Belt TG1900 Tower Crane erected on the left footing foundation of Pier 4. 
Lower Right: View the completed excavation for Pier 4 right.
Lower Left: Ladd & Associates utilizing a trackhoe to remove fallen rock contained by a Rock Fall Containment system constructed near Pier 4.
Upper Left: Obayashi / PSM, JV personnel constructing formwork for the footings of Pier 3 left and right.

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View of the bridge alignment taken from downstream of Hoover Dam. Nevada approach appears to the left with Arizona to the right. Visible near the top of this picture is the twin 3” cables spanning the canyon for one of two cableway cranes.

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View the completed excavation for Pier 5 (Nevada skewback). The excavated face shown is approximately 100’ high. Corrosion protection covers of the installed rock anchors in the excavation walls are visible in the excavated rock face.

Hoover Dam appears near the lower left of the picture.

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View of the south Cableway Crane tower in Arizona depicting the pull cable slack carriers, hoist trolley, and tower stabilization cables.

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View of the twin 14 part pulley system of the south Cableway Crane tower in Nevada. These pulleys apply tension to the twin 3” highline cables that span the canyon.

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View of the Arizona Skagit hoist used for erection of the Cableway Crane system.

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View of the future bridge alignment taken from Abutment 2 (Arizona) looking towards Abutment 1 (Nevada).
Foreground: The Link Belt TG1900 Tower Crane erected on the left footing of Pier 15. 
Background: Visible are the footings and excavations for Abutment 1, Piers 1 through 5 (Nevada skewback), along with the Link Belt TG1900 Tower Crane erected on the left footing of Pier 4.

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Olsen Beal personnel winding cable onto a temporary reel during the construction of the cableway crane in Arizona.

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Images from December 2005

Colorado River Bridge...

View of the bridge alignment from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Foreground: Obayashi / PSM, JV constructing formwork and placing reinforcing steel for Abutment 1. 
Background: Ongoing excavations for Pier 14 (Arizona skewback) and Abutment 2 along with the towers of the temporary cableway crane.

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View of the bridge alignment taken from downstream of Hoover Dam depicting the Nevada approach pier excavations.  The Link Belt TG1900 Tower Crane is erected on Pier 4 left foundation.

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View of the bridge alignment taken from downstream of Hoover Dam depicting the Arizona approach pier excavations.  The Link Belt TG1900 Tower Crane is erected on Pier 15 left foundation.

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Olsen Beal constructing the cableway crane in Arizona.

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Upper right: View of the helicopter transporting a half-inch cable across the canyon for stringing of the cableway.  Barely visible below the helicopter is a hoop in the line used to grab once it reaches the Nevada side.  The second helicopter is being utilized as a spotter.

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View of the bridge alignment taken from downstream of Hoover Dam.  Nevada approach appears to the left with Arizona approach to the right.  Visible near the top of this picture is the twin 3" cables spanning the canyon for one of two cableway cranes.

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Images from November 2005

Colorado River Bridge...

View of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona). Shown are the ongoing excavations for Pier 14 (Arizona skewback) and Abutment 2.  In the background of this picture, are the towers of the temporary cableway crane which will span the canyon and be utilized for construction of the bridge.

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Obayashi / PSM, JV personnel ready column segment formwork in preparation for concrete placement. Segments are wet cast against the next lower piece to assure a good match cast joint.

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View of the completed precast column segments stored and ready for shipment at the Obayashi / PSM, JV precast yard located near Boulder City, Nevada.

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Foreground: View of the ongoing excavations for Pier 5 (Nevada Skewbasdk) and Pier 3, and completed footings of Piers 1 and 2.

Background: The towers of the temporary cableway crane which will span the canyon and be utilized for construction of the bridge.

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Foreground: Ladd & Associates continuing excavation for Pier 14 (Arizona Skewback) and Abutment 2 and installing rock containment fencing on the canyon wall at Pier 14.

Background: The towers of the temporary cableway crane which will span the canyon and be utilized for construction of the bridge.

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Ladd & Associates utilizing a trackhoe and rock hammer to fine grade the excavation of Pier 5 (Nevada skewback).  Bottom left in this picture is the rock containment fencing installed on the canyon face.

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View of the installed rock anchors of the north rock excavated face of Pier 5 (Nevada Skewback).  A temporary ladder system is in the process of being bolted to this wall to allow personnel access to the footing from the Nevada Hairpin area.

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Ladd & Associates utilizing a trackhoe and rock hammer to fine grade the excavation of Pier 5 (Nevada skewback). Top left in this picture is the Colorado River, approximately 650-feet below the level of this excavation.  Top right is a temporary rock containment structure.

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Images from October 2005

Aerial Photos of the New US 93...

Aerial view of the new alignment in Arizona from Station 270+00 to 198+00 including the interim US 93 roadway.

Foreground: View of the Arizona Interchange and associated ramps, including the Sugarloaf Mountain TIOP Bridge.

Background: Sugarloaf Mountain Bridge.

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Aerial view of the new alignment from Station 63+00 to 123+00.

Bottom Left: Hoover Dam Canyon Bridge.

Top Right: Hoover Dam Lower Portal Access Road Overpass (Structure H-2701), the Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702), and the Hoover Dam Old US 93 Overpass (Structure H-2703).

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Aerial view of the Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699) and the Gold Strike Canyon Access Road.

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Aerial view of the new alignment from Station 75+00 to 26+93.

Foreground: Hoover Dam Canyon Bridge (Structure H-2700).

Background: View of the Nevada Interchange and associated ramps, including the Hoover Dam Interchange Bridge (Structure H-2699) and the Gold Strike Canyon Access Road.

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Aerial view of the new alignment from Station 123+00 to 71+00 including the Hoover Dam Old US 93 Overpass (Structure H-2703), the Hoover Dam BOR Warehouse Old US 93 Overpass (Structure H-2702), and the Hoover Dam Lower Portal Access Road Overpass (Structure H-2701).

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Aerial view of the new alignment as it ties into the existing US 93 in Nevada.

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Colorado River Bridge...

Aerial view of the Obayashi / PSM, JV precast yard located near Boulder City, Nevada.  Four hundred-forty (440) precast segments, each weighing approximately 35 tons, will be constructed for the bridge approach and spandrel columns.

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Aerial view of the new alignment looking from Arizona towards Nevada showing the location of the future Colorado River Bridge.

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Aerial view of the future bridge alignment taken from Abutment 2 (Arizona) looking towards Abutment 1 (Nevada).  Shown are the ongoing excavations for Pier 5 (Nevada skewback) and Pier 3, and completed footings of Piers 1 and 2 along with the excavation for Abutment 1 footing.

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Aerial view of the future bridge alignment taken from Abutment 1 (Nevada) looking towards Abutment 2 (Arizona).  Shown are the ongoing excavations for Pier 14 (Arizona Skewback) and Abutmen