An image showing an aerial view of Hoover Dam and Lake Mead. Part of the plane from which the image was taken are visible. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of concrete being placed into the side walls of diversion tunnel #4 at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of concrete being placed into the side walls of diversion tunnel #4 at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.