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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.

Black and white image of Hoover Dam construction. A cat-walk is visible, spanning the canyon over the upstream cofferdam. The span is approximately between triangulation points C-7 and C-8. Elevation at the middle of the span is approximately 1,005 feet. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam construction. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of the spillway on the Nevada side of Hoover Dam. This view shows the spillway running at peak capacity of 13, 944 cubic feet per second and 4.5 feet above spillways gates.

Color image of Hoover Dam looking upstream and showing the white water of the Colorado River below the spillway tunnel outlets. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of the construction phase of the Boulder Dam Project, also known as Hoover Dam. This image features the mixing of the oil finish for Hemenway Wash Road.

Black and white image of the gravel testing laboratory at the site of the former Stewart Ranch, also known as the Las Vegas Ranch, after completed repairs to the building. Site Name: Las Vegas Ranch (Las Vegas, Nev.)