Black and white image of the Hoover Dam tunnel construction site. There are four visible bridges over the Colorado River. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of the Hoover Dam tunnel construction site. There are four visible bridges over the Colorado River. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image from one of the Hoover Dam spillways of the dam face, intake towers and electric transmission towers in Black Canyon. Note: Boulder Dam was officially renamed Hoover Dam in 1947.