The first attempt to gain Congressional approval for construction of Boulder Dam of Representatives and the Senate, two bills were introduced in 1922. Boulder Canyon dam should be built at the beginning of the program, and the program called Boulder Canyon Project. In January 1922, Hoover in their states' use of Colorado River water apportioning work out a reasonable arrangement, Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming met state governors.
Even that's still not changed over the river cofferdam construction, which began in September 1932. November 24, 1922 resulting Colorado River Compact signed on, each of the states to determine whether water can be divided into upper and lower parts of the river basin separated.

The largest dam, flood control, irrigation, water flow, and built to provide hydroelectric energy production. In December 1928, both the House and Senate finally approved the bill and sent it to the president for approval. December 21, 1928, on bill approved by President Calvin Coolidge signed the Boulder Canyon Project. Solid Rock Dam rest, until it reaches the bedrock of sound accumulated erosion of the riverbed was necessary to remove soil and other loose objects. President Herbert Hoover as the initial appropriation for construction was made in July 1930.

During excavations for the foundation, meaning approximately 1,500,000 cubic yards (1,150,000 m 3) was deleted. A gravity dam - after that type of curve, a side canyon walls that bear the force of the impounded lake.

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