Duplicate images of visitors standing in line to board the visitors' elevator at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
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.