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Black and white image of a mud deposit at Hoover Dam. This site can be seen at mile 257, and a member of the survey crew displays a representative sample of one of the mud cubes formed to show the depth of the crevices. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of workers placing concrete in column H-5 between elevation 630 and elevation 635 during the test pour made before the Hoover Dam Board of Consulting Engineers. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam. A rare view of Hoover Dam against a cloud pattern in a desert sky that is usually clear. The world-famous dam, completed by the Bureau of Reclamation, conquered the Colorado River for the first time in history. The dam, spanning the river between Nevada and Arizona, provides all of Reclamation's multipurpose benefits: flood protection, river control, water storage and conservation for irrigation; municipal and industrial uses; generation of low-cost hydroelectric energy; enhancement of navigation; recreation; and fish and wildlife protection.

Black and white image of a barge used to transfer trucks and heavy materials across the Colorado River during the construction phase of the Boulder Canyon Project, better known as Hoover Dam. This specific barge is equipped with a double drum hoist. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "Looking upstream through Nevada spillway. Overflow weir under construction at right, completed section of channel lining and parapet at left." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "Thirty-foot-diameter-steel-penstock pipe set up from joint assembly at the Babcock and Wilcox Co. Plant." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image, from left to right, of Art Linkletter, Dick Woodward, and Commissioner of the Bureau of Reclamation, Ellis L. Armstrong, at a party held by the Young Presidents' Organization. The party for nearly 1,000 people was held on the roof of the powerhouse at Hoover Dam. The visitors, all wearing hard hats, were the first to use this setting.