From the Morgan Sweeney Photograph Collection (PH-00228). Hoover Dam switchyard, circa 1950s. Stamp on the back reads, "Photograph by Bureau of Reclamation BCP 9187 Boulder Canyon Project Boulder City, Nevada."
An image from one of the Hoover Dam spillways of the dam face, intake towers and electric transmission towers in Black Canyon. Note: Boulder Dam was officially renamed Hoover Dam in 1947.