Hoover Dam is a 726-foot high structure and is 660 feet thick at its base. The entire project required 4.4 million yards of concrete. The dam was completed two years ahead of schedule, and at the peak of construction, more than 5000 people were employed to build the gigantic engineering monument in Black Canyon. It was cited by the American Society of Enigineers in 1955 as one of the seven enginnering wonders of the world. The 17 generators produce 4 to 5 billion kilowatt-hours of electricity annually, and provide to Arizona, southern California and southern Nevada.
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