Black and white image of concrete being placed into the side walls of diversion tunnel #4 at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of concrete being placed into the side walls of diversion tunnel #4 at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Hoover Dam construction, including work on the dam forms and intake towers. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
A group of individuals viewing the Hoover Dam from the very bottom of the basin. They are all looking up at the massive concrete structure. Site Name: Hoover Dam (dam)
Black and white image of the construction phase of Hoover Dam. The metal framework seen at the base of the dam will later become the dam's powerhouse. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Hoover Dam as seen from the control tower of the 150-ton cableway on the Nevada rim of Black Canyon. Note: Boulder Dam was officially renamed Hoover Dam in 1947.