Hoover Dam
When completed in 1935, the Hoover Dam 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. It is currently the world's 35th-largest hydroelectric generating station and is the second highest dam in the United States.
This huge dam was built to help keep the silt and sediment out of the Colorado River, for flood control, and for hydroelectric-power generation. There is enough concrete in the dam to pave a two-lane highway from San Francisco to New York.
Hoover Dam serves as the Colorado River crossing for the Highway U.S. Route 93. The just two-lane section of road approaching the dam is narrow, has several dangerous hairpin turns, and is subject to rock slides.
To provide much more highway capacity, and better safety, the new Hoover Dam Bypass is scheduled to be completed in the year 2010 and it will divert the U.S.-93 traffic 1,500 feet downstream from the dam.
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