Boulder Dam officially renamed Hoover Dam 70 years ago today #OnThisDay #OTD (Apr 30 1947)

Video: 'American Experience Hoover Dam'

(Wednesday, April 30, 1947) — U.S. President Harry S. Truman signed a resolution today changing the name of Boulder Dam, a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona, to Hoover Dam, after former President Herbert Hoover.

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