Black and white image of the construction phase of the Boulder Canyon Project, also known as Hoover Dam. Excavation for the Hoover Dam construction substation by the Nevada-California Power Company is visible. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
From the Morgan Sweeney Photograph Collection (PH-00228). Hoover Dam. [Working on Hoover Dam] June 3, 1955. Stamp on verso: "P45-301-10534-A Official Photograph United States Department of the Interior Bureau of Reclamation If reproduced credit U.S. Bureau of Reclamation Photo by F. S. Finch JUN 3 1955."
A view of the downstream face of Hoover Dam; from this angle the power house can be seen at the base of the dam, along with intake towers in Lake Mead.