Figure 9 - Arch Rib Form Travelers and Temporary Stay Towers.(Photo courtesy of T.Y. Lin International.)

The Colorado River Bridge at Hoover Dam is taking shape next to the historic Hoover Dam, spanning the Black Canyon between the States of Arizona and Nevada, USA. When complete, the 323 m concrete segmental arch will be the 4th longest concrete arch in the world, and the longest in the United States.

Arch construction is back in full production with replacement of the cable-way and full operation of the segmental arch form travelers (Fig. 9). Both the Nevada and Arizona approach structures are complete, serving now as staging for arch construction.

Form travelers for all four arch rib headings are advancing in synchronized operations. The arch ribs have been cast out to the location of the first temporary stay support, and are now awaiting completion of the temporary stay towers and tensioning of the first sets of stays.

Arch construction is scheduled through next year, with completion of the Bypass scheduled for late 2010. Progress can be viewed at http://www.hooverdambypass.org/

Hoover Dam Bypass Delivery Manager: Central Federal Lands Highway Division, FHWA
Colorado River Bridge Designer: T.Y. Lin International w/HDR
Contractor: Obayashi/PSM Construction USA, Inc., a JV
Construction Engineers: OPAC and McNary Bergeron & Associates
PT and Stay Supply: Schwager Davis Incorporated
Form Traverlers: NRS-USA