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Hoover Dam, originally known as Boulder Dam, is a complete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U. S. states of Nevada and Arizona. When completed in 1936, it was both the world's largest electric power generating station and the world's largest concrete structure. Currently, it is the world's 35th-largest hydroelectric generating station.

Located 30 miles (48 km) southeast of Las Vegas, Nevada, is named after Herbert Hoover, who played an instrumental role in its construction, first as the Secretary of Commerce and then later as President of the United States. Construction began in 1931 and completed more than two years ahead of schedule, in 1936. Designated a National Historic Landmark in 1985.

Lake Mead is the resevoir created behind the dam, named after Elwood Mead, who oversaw the construction of the dam.

source information : wikipedia

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