Postcard showing the Black River Canyon, which is located between Nevada and Arizona, before the Hoover Dam (Boulder Dam) was built. In 1928, the U.S. Congress passed the Boulder Canyon Project Act , which authorized the construction of the Boulder Dam on the Colorado River. In 1930, President Herbert Hoover signed a bill appropriating the funds for its construction, and Six Companies Inc. was awarded the contract to build the dam. Construction on the Boulder Dam began in 1931, and it was completed in 1935. The dam's powerplant wings were completed in 1936, and its first generator began operating that year. The seventeenth and final generator began operating in 1961. On April 30, 1947 a joint resolution of Congress decreed that the name of the dam be changed to Hoover Dam after President Herbert Hoover, who had strongly supported its construction. Lake Mead, which was created by the Hoover Dam, is America's largest man-made reservoir, and it can hold up to 9.2 trillion gallons ...
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