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Colorado decision undermining the claims of the upstream states, they became anxious to reach an agreement.The resulting Colorado River Compact was signed on November 24, 1922.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 (when it is full).Edison allowed land options it held on the river to lapse—including an option for what became the site of Hoover Dam.In the following years, the Bureau of Reclamation (BOR), known as the Reclamation Service at the time, also considered the Lower Colorado as the site for a dam.Though water from the Imperial Canal allowed for the widespread settlement of the valley, the canal proved expensive to maintain.

The dam's generators provide power for public and private utilities in Nevada, Arizona, and California. Route 93 (US 93) ran along the dam's crest until October 2010, when the Hoover Dam Bypass opened.Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U. Its construction was the result of a massive effort involving thousands of workers, and cost over one 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. 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.