Men stand inside a diversion tunnel at the Hoover Dam. The Hoover Dam was called the Boulder Dam until 1947. "BDRA. NEV. 4.36 341" is written at the top of the photo. Site Name: Hoover Dam (dam)
From the Morgan Sweeney Photograph Collection (PH-00228). Unit A-4 turbine at the Hoover Dam, showing the wicket gates, runner, and shaft in place in 1951.
Illustration of the construction of Boulder Dam, later called Hoover Dam. Caption reads: "Boulder Dam and lower portals of diversion tunnels. Colorado River."
Various photographs of the Hoover Dam area looking north east. The Black Canyon, Fortification Hill, and the Colorado River can be seen in the photographs.