Black and white image of Hoover Dam construction. A cat-walk is visible, spanning the canyon over the upstream cofferdam. The span is approximately between triangulation points C-7 and C-8. Elevation at the middle of the span is approximately 1,005 feet. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of the downstream face of Hoover Dam and its power plant at night, as seen from the lower portal road at the dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of crowds waiting to visit the Hoover Dam power plant on Memorial Day in 1937. Many people are holding tickets ready for the guide to collect. The roof of the cashier's booth is visible beyond the awning. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of the Arizona-side generator room at Hoover Dam, as seen from the balcony at elevation 705. The 40,000 kilowatt ampere generator installed in unit 48 is visible in the background. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Lake Mead, including boat docks and a bathing beach developed by the National Park Service for recreational use, such as swimming and picnicking.
Black and white image of "Big Bertha," the Six Companies, Inc. motor transport used to haul workmen between Boulder City and Hoover Dam. This double-decker truck could haul 154 men. 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.