Hoover Dam Bypass - Arizona Approach
As part of the Arizona Approach to the Hoover Dam Bypass Project, Vastco entered into a joint venture with R.E. Monks Construction of Fountain Hills, Arizona. As construction manager for the project, Vastco coordinated the effort to construct two new structures that cross a 160-foot deep desert canyon and approach the Colorado River approximately 1,500 feet downriver from Hoover Dam. The signature structure is a 7-span 902-foot long concrete type 6 ASHTO girder bridge. The other structure is a single span 145-foot long type 6 ASHTO girder bridge that will become the traffic interchange accessing to the Hoover Dam. Performed in an environmentally sensitive habitat, the project team drilled, shot and excavated 1.7 million cubic yards of materials, constructed bridges, realigned the existing Hoover Dam access roads, and improved Park Service access. All work minimized impact to endangered Desert Bighorn Sheep and Desert Tortoise. The Monks-Vastco joint team team of experts completed the $21.5 million Arizona Approach on time and within Federal Highway Administration schedule.