Looking upstream at the dam site, Hoover Dam, January 1933. Construction materials and small bridges line the canyon above the river as the dam is being built.
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.
From the Morgan Sweeney Photograph Collection (PH-00228). The stone monument reads, "A Modern Civil Engineering Wonder of the United States - One of Seven Selected by the Ameircan Society of Civil Engineers, 1955. Nevada-Arizona."
From the Morgan Sweeney Photograph Collection (PH-00228). Number 2 Warehouse the contractors yard on November 28, 1950. Stamp on the back reads, "Photograph by Bureau of Reclamation BCP # 8120 Boulder Canyon Project Boulder City, Nevada."
An image of an unidentified man standing on power generator equipment in the powerhouse at Hoover Dam. Boulder Dam was officially renamed Hoover Dam in 1947.
An image of visitors posing in the gallery leading from the elevator to the Hoover Dam powerhouse. Boulder Dam was officially renamed Hoover Dam in 1947.