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with inflation) | owner = United States Government | operator = U.S. Bureau of Reclamation | res_name = Lake Mead | res_capacity_total = | res_capacity_active = | res_capacity_inactive= | res_catchment = | res_surface = 〔 | res_max_depth = | res_max_length = | res_max_width = | res_elevation = | plant_operator = U.S. Bureau of Reclamation | plant_turbines = 13× 130 MW 2× 127 MW 1× 68.5 MW 1× 61.5 MW Francis-type 2× 2.4 MW Pelton-type | plant_capacity = 2,080 MW | plant_annual_gen = 4.2 billion kWh〔 | plant_commission = 1936 - 1961 | website = (Bureau of Reclamation: Lower Colorado Region - Hoover Dam ) | extra = }} 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 Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30, 1935, by President Franklin D. Roosevelt. Its construction was the result of a massive effort involving thousands of workers, and cost over one hundred lives. The dam was controversially named after President Herbert Hoover. 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 some of the techniques were unproven. The torrid summer weather and lack of facilities near the site also presented difficulties. Nevertheless, Six Companies turned over the dam to the federal government on March 1, 1936, more than two years ahead of schedule. Hoover Dam impounds Lake Mead, the largest reservoir in the United States by volume.〔(【引用サイトリンク】title=Reservoir Monitoring & Research )〕 The dam is located near Boulder City, Nevada, a municipality originally constructed for workers on the construction project, about southeast of Las Vegas, Nevada. The dam's generators provide power for public and private utilities in Nevada, Arizona, and California. Hoover Dam is a major tourist attraction; nearly a million people tour the dam each year. The heavily travelled U.S. 93 ran along the dam's crest until October 2010, when the Hoover Dam Bypass opened. == Background == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hoover Dam」の詳細全文を読む スポンサード リンク
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