Hoover Dam Bypass
Las Vegas, Nevada, United States
Client: Federal Highway Administration-Central Federal Lands Highway Division
Parsons Brinckerhoff Role: Construction Management
The Hoover Dam Bypass is a 3.5-mile (5.6-kilometer) corridor on U.S. 93 beginning in Clark County, Nevada, crossing the Colorado River approximately 1,500 feet (457 meters) downstream of the Hoover Dam, and terminating in Mohave County, Arizona. As a member of the construction management team, Parsons Brinckerhoff assisted in construction management and design support of the bypass and also provided construction engineering and inspection services throughout the construction phase of the project.
The central portion of the $240 million Hoover Dam Bypass Project was a 1,900-foot-long (579-meter-long) composite concrete arch steel deck bridge (the Mike O’Callaghan—Pat Tillman Memorial Bridge) with a main span of 1,060 feet (323 meters), making it one of the largest concrete arch bridges in the world. The arch was constructed using a temporary cable-stay construction sequence, which involved coordination and management using an integrated engineering approach among the contractor, engineer and owner.
Parsons Brinckerhoff assisted the Federal Highway Administration (FHWA) with daily oversight and management of the project, staffing/team building, budgeting, scheduling, engineering coordination, constructibility reviews, contract development, environmental mitigation, contract compliance/modifications, labor compliance, project administration, public relations, and partnering. Parsons Brinckerhoff also supported the FHWA with the interface of multiple stakeholders to assure smooth progress of construction and coordinated activities with all project stakeholders.
The FHWA, in conjunction with the other stakeholder agencies, officially opened this new segment of U.S. 93 on October 19, 2010. The new route improves a major commercial corridor among Arizona, Nevada, and Utah; removes the existing potentially dangerous highway geometry; and protects the natural and manmade resources at Hoover Dam.