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.
Caption at bottom of postcard reads: 150 man transport- Boulder Dam Bureau of Reclamation Photo." Boulder Dam was officially re-named Hoover Dam in 1947.
An image of the downstream face of Hoover Dam in Black Canyon. Automobiles are visible in an observation area, and some of the electric transmission towers are visible in the foreground. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image showing an aerial view of people on the bridge overlooking one of the Hoover Dam spillways and the surrounding area in Black Canyon. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of water flowing over one of the Hoover Dam spillways. Electric transmission towers in Black Canyon are visible in the background, and automobiles are parked in an observation area in the foreground. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of automobiles on the road over the top of the face of Hoover Dam. Two of the intake towers and one of the spillways are visible in the background. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of electric transmission towers in Black Canyon angled over the downstream side of Hoover Dam. The intake towers and traffic on the road over the dam face are visible. Note: Boulder Dam was officially renamed Hoover Dam in 1947.