THE BLACK CANYON OF THE COLARADO RIVER

THE BLACK CANYON OF THE COLARADO RIVER

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Hoover Dam, once known as Boulder Dam, is a concrete arch gravity dam in the Black Canyon of the Colarado River, on the border between the US states of Arizona and Nevada. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30th 1935 by President Franklin D.Roosevelt.