Black and white image of swing shift construction workers sitting in trucks, ready to leave from dormitory #2 in Boulder City to Hoover Dam. Prior to the arrival of cold weather, the canyon workers were transported to their jobs in buses. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Hoover Dam with the following printed description: "View of 50-foot diameter tunnel below Arizona Tunnel Plug outlet works with Stoney Gate at end of tunnel lowered." Note: Boulder Dam was officially renamed Hoover Dam in 1947.