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)