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Hoover Dam Bypass

Hoover Dam Bypass (Known places)

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Hoover Dam

Hoover Dam, once known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Arizona and Nevada. When completed in 1936 (81 years ago), it was both the world's largest electric-power generating station and the world's largest concrete structure. It was surpassed in both these respects by the Grand Coulee Dam in 1945 (72 years ago). It is currently the world's 35th-largest hydroelectric generating station.

This dam, located 30 mi (48 km) southeast of Las Vegas, Nevada, is named after Herbert Hoover, who played an instrumental role in its construction, first as the Secretary of Commerce, and then later, as the President of the United States. Construction began in 1931 (86 years ago), and was completed in 1936 (81 years ago), more than two years ahead of schedule. The dam and the power plant are operated by the Bureau of Reclamation of the U.S. Department of the Interior. Listed on the National Register of Historic Places in 1981 (36 years ago), Hoover Dam was designated a National Historic Landmark in 1985 (32 years ago).

Lake Mead is the reservoir created by the dam, named after Elwood Mead, who oversaw the construction of the dam.

Mike O'Callaghan-Pat Tillman Memorial Bridge

Mike O'Callaghan-Pat Tillman Memorial Bridge, known as the Hoover Dam Bypass during planning and early construction, provides a bridge connecting roads for a new route across the Colorado River for U.S. Route 93. The project links the U.S. states of Nevada and Arizona by spanning the Colorado River 1,600 ft (490 m) downstream from the Hoover Dam. The entire project is expected to be completed by sep. 2010 (7 years ago). Its cost has been estimated to be about $240 million.

The bridge and the new sections of U.S. Highway 93 will be 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 will be 840 ft (260 m) above the river. When completed, it will be the first so-called concrete-steel composite arch bridge built in the United States. 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 will be able to park and walk across the bridge for views of the Hoover Dam, but the dam will not be visible to most drivers on the bridge.

Milestones

Mid 2006 (11 years ago) - The bridge's construction was in its beginning stages when a permit problem between Clark County and subcontractor Casino Ready Mix arose over the operation of a concrete batch plant for the project.
April 2007 (10 years ago) - The bypass and the bridge were under construction and large cranes were visible near the river when looking from Hoover Dam.
March 2008 (9 years ago) - The approach spans were completed, consisting of seven pairs of concrete columns -- five on the Nevada side and two on the Arizona side. The spans will act as the springboard for the remaining segments, with two more cable towers to be built on them to complete construction of the bridge.
May 2009 (8 years ago) - The concrete arch 50% completed, and on track for closure in the third quarter of 2009 (8 years ago). A most of the arch segments have been cast in place using a temporary form traveler system. Other completed work includes the precast segments for the bridge columns which will support the roadway on the arch.
August 2009 (8 years ago) - The twin arch spans were closed with the casting of the center segments. With the removal of the temporary cable stays, the arch is self supporting.


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