From the Morgan Sweeney Photograph Collection (PH-00228). Unit A-4 turbine at the Hoover Dam, the boring mill in operation boring for lower stationary seal on September 17, 1951.
An image showing a bird's eye view of visitors peering over a lookout point at Hoover Dam. Boulder Dam was officially renamed Hoover Dam in 1947. Caption on bottom of image reads: "Lookout Point - Hoover Dam - 293 Oakes."
An image showing a bird's eye view of the Hoover Dam's downstream face and Fortification Hill. Note: Boulder Dam was officially renamed Hoover Dam in 1947.