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  1. Mike O'Callaghan - Pat Tillman Memorial Bridge (Hoover Dam Bypass) The Central Federal Lands Highway Division of the Federal Highway Administration awarded us a contract to provide design and construction support services for the landmark Mike O'Callaghan - Pat Tillman Memorial Bridge. Under the management of CFLHD, we led an integrated team of ...

  2. Jun 02, 2018 · The Mike O’Callaghan-Pat Tillman Memorial Bridge stretches 1,905 feet to connect Clark County, Nevada and Mohave County, Arizona and is named in honor of a notable figure from each state: Mike OCallaghan was a decorated Korean War veteran, Governor of Nevada from 1971–1979, and former executive editor of the Las Vegas Sun.

  3. Aug 30, 2011 · The Mike O'Callaghan – Pat Tillman Memorial Bridge, the key component to the Hoover Dam Bypass project, was the first concrete-steel composite arch bridge built in the United States, and it. By Bill Kirchner, August 30, 2011. 3. Mike O'Callaghan – Pat Tillman Memorial Bridge Marker. View east on pedestrian walkway.

  4. With a 1,060-foot main span, the Mike O’Callaghan-Pat Tillman Memorial Bridge or Hoover Dam Bypass Bridge is the fourth-longest, single-span concrete arch bridge in the world and exemplifies innovation at work. The project team overcame formidable obstacles and, as a result, a world-class structure was born.

  5. Stantec’s bridge engineers did just that when they inspected the majestic Mike O’Callaghan-Pat Tillman Memorial Bridge just downstream from the iconic Hoover Dam. This aesthetic spandrel arch bridge spans 870 feet above the Colorado River.

    • Justification For A New Bridge
    • Design
    • Building The Bridge and Bypass Roads
    • Milestones

    The bypass was constructed to improve safety, security, and traffic capacity. Through extensive studies this bridge was determined to be the best route for the bypass. U.S. Highway 93 (in conjunction with U.S. Highway 60 via Wickenburg, Arizona) is the primary link between Phoenix and Las Vegas, two cities that have seen population explosions since the Hoover Dam's completion. The section of U.S. 93 that approached and crossed Hoover Dam is not adequate for modern traffic needs. It is narrow, one lane in each direction, has many dangerous curves, including several hairpin turns, and has poor sight distances especially at night. Combined with sightseeing and pedestrian traffic at the dam, traffic often came to a standstill. As a consequence of the heightened security measures following the September 11, 2001 attacks, truck traffic over the Hoover Dam had been diverted south to a river crossing near Laughlin, Nevada, in an effort to safeguard the dam from hazardous spills or explosion...

    The bridge and the new sections of U.S. Highway 93 are four lanes wide. Total length of the bridge is 1,900 feet (579 m) with a 1,080 ft (330 m) main span. The roadway is 840 ft (260 m) above the river. It is the first concrete-steel composite arch bridge built in the United States. The twin arch ribs are connected by steel struts. The composite design, using concrete for the arch and columns with steel construction for the roadway deck, was selected for schedule and cost control while still being aesthetically compatible with Hoover Dam. Pedestrians are able to park and walk across the bridge for views of the Hoover Dam, but the dam is not visible to most drivers on the bridge.

    The largest obstacle to the project was the river crossing itself. The bridge and the bypass were constructed by a consortium of different government agencies and contractors, among them the Federal Highway Administration, the Arizona Department of Transportation, and Nevada Department of Transportation. The master design is by HDR, Inc. T.Y. Lin International designed the bridge and Sverdrup Civil, Inc. (the successor to Sverdrup & Parcel that is now a subsidiary of Jacobs Engineering Group) designed the approaches. Construction required hoisting workers and up to 50 tons of materials 890 feet (270 m) above the Colorado River using 2,300 ft (700 m)-long steel cables held aloft by a "high-line" crane system. The arches are made of 106 pieces -- 53 per arch -- mostly cast-in-place 24 ft (7.3 m) at a time.

    Planning and environmental work is completed and the environmental impact statement is issued. Design of the preferred alternative begins. Work begins on the approaches in both states. The construction contract for the arch bridge is awarded. In late 2004, the bridge name honoring Mike O'Callaghan and Pat Tillman was announced at a ceremony by Nevada governor Kenny Guinn and Arizona governor Janet Napolitano. O’Callaghan was a decorated Korean War veteran and was governor of Nevada from 1971 to 1979. He served as executive editor at the Las Vegas Sun newspaper. He suffered a heart attack and died on March 5, 2004. Tillman was an Arizona State University and Arizona Cardinals football player who gave up his multi million-dollar career in the National Football League to enlist in the U.S. Army, and was killed by friendly fire in Afghanistan. Strong wind gusts across Black Canyon on September 15, 2006 appear to be the cause for the collapse of the "high-line" crane system used to carry...

  6. The Mike O'Callaghan – Pat Tillman Memorial Bridge downstream of Hoover Dam officially opened to traffic in October 2010. Vehicles travelling on U.S. Highway 93 no longer cross the dam. Visitors to the dam must now exit U.S. 93 at Nevada State Route 172 to reach the site. The dam is not open to through-traffic.

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