A general view of construction of a bridge across Colorado River.

A man fishing on the shore of Lake Mead with a boat floating in the background, both of which were located near the upstream face of Hoover Dam. The film transparency includes two duplicate images.

Photograph of two women posing inside a section of the penstock piping at the Babcock & Wilcox steel fabrication plant, 1933-1934.

Black and white image of men standing next to"cover wagons" in Boulder City. Nine cover wagons, each having a capacity of 48 men, were used to transport workmen from Boulder City to Black Canyon for the construction of the Hoover Dam. These buses were canvas-covered with side curtains that could be raised during hot weather. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

This series of photographs documents the historic water overflow at Hoover Dam as seen from the Arizona side of the dam. Taken in August of 1983, this overflow marked the first time the spillways were used during a flood. After initially being filled, the spillways were tested once in August of 1941.

This series of photographs documents the historic water overflow at Hoover Dam as seen from the Arizona side of the dam. Taken in August of 1983, this overflow marked the first time the spillways were used during a flood. After initially being filled, the spillways were tested once in August of 1941.

This series of photographs documents the historic water overflow at Hoover Dam as seen from the Arizona side of the dam. Taken in August of 1983, this overflow marked the first time the spillways were used during a flood. After initially being filled, the spillways were tested once in August of 1941.