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.
An image of a crew with a truck full of lighting equipment for night-time work near Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of Hoover Dam's upstream side. Text from image reads: "Looking Upstream from Boulder Dam, Showing Lower Lake Mead and Highway from Kingman, Arizona [copyright] BDSB." Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of the completed Hoover Dam with water seen spilling through the Arizona penstock outlets. Note: Boulder Dam was officially renamed Hoover Dam in 1947.