Grand Canyon tour. Hoover Dam.

“Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the US states of Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on 30 September 1935 by President Franklin D. Roosevelt. Its construction was the result of a massive effort involving thousands of workers, and cost over one hundred lives. Originally known as Boulder Dam from 1933, it was officially renamed Hoover Dam, for President Herbert Hoover, by a joint resolution of Congress in 1947.”