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Uploaded on Nov 5, 2009
Originally called Boulder Dam, the Hoover Dam straddles the border of Arizona and Nevada. Construction began in 1933 and was completed two years later. Built with 3.2 million cubic yards of concrete, the dam is some 726 feet high, ranking 20th in the world for height. From 1939 to 1949 it was the worlds largest producer of hydroelectric power; today the dam generates some 4.2 billion kilowatt-hours of electricity annually. Lake Mead, the reservoir created by the dam, covers 247 square miles and is a major recreation area.
Construction footage of the building of Hoover Dam. (U.S. Bureau of Reclamation, U. S. Department of the Interior)