An image of the downstream face of Hoover Dam in Black Canyon. The dam's power plant, outlet works and diversion tunnel portals are visible in the foreground. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Caption at bottom of image reads: "Trucking mamoth (sic) concrete buckets in the 50 ft. dia. tunnels, Boulder Dam." Boulder Dam was officially re-named 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.
A grayscale image showing the downstream face of Hoover Dam and cars parked at a lookout point. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
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.
An image of an unidentified man standing on power generator equipment in the powerhouse at Hoover Dam. Boulder Dam was officially renamed Hoover Dam in 1947.