Black and white image of the construction phase of the Boulder Canyon Project, also known as Hoover Dam. Excavation for the Hoover Dam construction substation by the Nevada-California Power Company is visible. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of the spillway on the Nevada side of Hoover Dam. This view shows the spillway running at peak capacity of 13, 944 cubic feet per second and 4.5 feet above spillways gates.