Black and white image of the Hoover Dam tunnel construction site. There are four visible bridges over the Colorado River. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

A painted photo depicting Lake Mead and Hoover (Boulder) Dam. Text on front of post card: "Lake Mead in Black Canyon, Boulder Dam", "Boulder Canyon Project of the Business of Reclamation"; Text on back of post card: "Lake Mead is quite narrow, just above Boulder Dam, yet more than 500 feet deep, where it is confined between the somber cliffs of Black Canyon gorge. Beyond the gorge the waters spread extensively over the desert valleys to form a vast lake 115 miles in length, with a shoreline of more than 550 miles - the largest man-made lake in the world. Comfortable cruisers make regular scheduled excursions on Lake Mead."

An image of the water-turned generator from Davis Dam. Located within Pyramid Canyon between Arizona and Nevada, Davis Dam was constructed on the Colorado River 67 miles downstream from Hoover Dam. Due to the Mexican Treaty of 1944, the United States was required to construct Davis Dam for regulation of water to be delivered to Mexico.

The downstream face of Hoover Dam.

An artist's color rendering of Lookout Point at Hoover Dam. Text printed on back of postcard: "Lookout Point has been the popular vantage point where thousands of sightseers have viewed with amaxed and intense interest, the progress and development in the building of this spectacular and enormous project. The view from the Nevada side, shows the downstream face of the Dam, the rugged cliffs in Arizona, and Fortification Mountain in the distance."

An image of Hoover Dam's crest and intake towers at night. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Unidentified artist's conception of completed Hoover Dam.