Panoramic image of Hoover (Boulder) Dam construction, early evening view, November 1933. Lights line the canyon walls as workers proceed with construction. Bright white light in the sky may possibly be a full moon.
Colorado River-Hoover Dam. Diagram of Boulder Dam in construction from book: Boulder Dam of the Great Southwest, by Ralph B. Simmons, 1936. Image taken January 4, 1940. Site Name: Hoover Dam (dam)
An image showing a bird's eye view of Hoover Dam from the Arizona side, featuring intake towers. Caption on bottom right of image reads: "Upstream face of Boulder Dam showing intake towers and Arizona observation point. [Copyright] BDSB." Boulder Dam was officially renamed Hoover Dam in 1947.
Illustration of Boulder Dam, later called Hoover Dam, with the view of lower portals and diversion tunnels. The caption reads: "Boulder Dam, looking upstream, showing Colorado River."