Black and white image of Hoover Dam under construction. This view is looking down into the upper cofferdam area from the rim of the Arizona side of Black Canyon. Also visible are a temporary earth diversion dam and steel sheet piling extending out from the Nevada abutment and marking the upstream toe of the cofferdam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Photograph of Hoover Power Plant's turbine generator unit during the construction of Hoover Dam, 1936. A General Electric sign can be seen in the photo.