Construction site of the Boulder Dam, now known as Hoover Dam. Marion electric drag line with 5 cubic yard capacity bucket loading gravel. Site Name: Hoover Dam (dam)
Workmen at the construction of Boulder Dam, now called Hoover Dam. Trimming jumbo used in scaling walls of diversion tunnels and removing projecting rock. Site Name: Hoover Dam (dam)
Color image of Hoover Dam looking upstream and showing the white water of the Colorado River below the spillway tunnel outlets. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image showing Hoover Dam's downstream face during the concrete pouring process. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of a row of power generators under construction at Hoover Dam. Several men are working on one of them. Boulder Dam was officially renamed Hoover Dam in 1947.