Black and white aerial view of Black Canyon at Hoover Dam construction site. There are four visible bridges going over the Colorado River. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of the downstream face of Hoover Dam in Black Canyon. Automobiles are visible in an observation area, and some of the electric transmission towers are visible in the foreground. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of the downstream face of Hoover Dam in Black Canyon. The dam's power plant, outlet works and diversion tunnel portals are visible in the foreground. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Hoover Dam visitors standing near freight car tracks, which were used to lower generators and related equipment to the power house. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of the sculptures titled, "Winged Figures of the Republic," as they sit facing Boulder Dam on a cloudy day. The photograph itself has stained splotches around the border. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of the illuminated downstream face of Hoover Dam at night, including the powerhouse. Note: Boulder Dam was officially renamed Hoover Dam in 1947.