View by Category


Graceful Twin Rib Concrete Arches

This bridge is now named the Mike O’Callaghan-Pat Tillman Memorial Bridge. The 1905 ft long structure includes graceful twin rib concrete arches that are the longest in the Western hemisphere. The arches span 1060 ft and rise nearly 900 ft above the Colorado River.

The Colorado River Bridge, a new 1,800 foot-long signature bridge, is the centerpiece of the Hoover Dam Bypass Project. Synterra Ltd / H2L2 is providing a unifying, context-sensitive aesthetic in final design services for the entire 3.5 mile-long corridor between Arizona and Nevada. In addition to the main river span, the project includes two interchanges, wildlife overpasses, a tunnel overpass, viaducts, mainline structures, retaining walls, a scenic overlook, and landscape restoration. The corridor will divert traffic from U.S. Highway 93, an overly crowded route that currently crosses the Hoover Dam. The Hoover Support Team comprises professionals from a joint venture of HDR Engineering, T.Y. Lin International, Sverdrup Civil, Inc., and supporting consultants. Synterra Ltd / H2L2 worked closely with all parties and coordinated its efforts with the Design Advisory Committee and the National Parks Service, as the new bridge and bypass is located on park property.

back to projects
view next