Must be viewed on black!
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 US. states of Arizona and Nevada. It was constructed between 1931 and 1936, and was dedicated on September 30, 1935 by President Franklin Roosevelt. Its construction was the result of a massive effort involving thousands of workers, and cost over a hundred lives.
Since about 1900, the Black Canyon and nearby Boulder Canyon had been investigated for their potential to support a dam that would control floods, provide irrigation water and produce hydroelectric power. In 1928, Congress authorized the project. The winning bid to build the dam was submitted by a consortium called Six Companies, Inc., which began construction on the dam in early 1931. Such a large concrete structure had never been built before, and many of the techniques were unproven. The torrid summer weather and the lack of facilities near the site were presented difficulties. Nevertheless, Six Companies turned over the dam to the Federal government on March 1, 1936, more than two years early.
Hoover Dam is located near Boulder City, Nevada, a municipality originally created for workers on the construction project, about 30 mi (48 km) south of Las Vegas, Nevada. The generators within the dam provide power for public and private utilities in Nevada, Arizona and California. Hoover Dam is a major tourist attraction, and U.S. 93, a heavily-travelled road, runs along its crest. In late 2010, traffic will be rerouted onto a bypass presently under construction, and the dam will be closed to traffic.