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Black and white image of John Chatfield Page, Senator Harold L. Ickes, Mrs. Ickes, and I. C. Harris, in the Nevada wing of the Hoover Dam power plant. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

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 a man and a car near a Deputy United States Marshal sign at the entrance to the Boulder Canyon Project Federal Reservation in Nevada.

The black and white image of a patient in a ward of the Six Companies, Inc. hospital in Boulder City.

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 boats used to transport men, powder, and supplies up and down the Colorado River in Black Canyon during the construction phase of the Boulder Canyon Project, better known as Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Ray Lyman Wilbur, Secretary of the Interior, at a ceremony which inaugurated construction on the Boulder City branch of the Los Angeles and Salt Lake Railroad, signaling the beginning of the Boulder Canyon Project, later known as Hoover Dam. From left to right, the men pictured include: Senator Key Pittman of Nevada; Governor Fred Balzar of Nevada; Carl Gray, President of Union Pacific Railroad system; Secretary Wilbur holding the Nevada silver spike; and Senator Tasker L. Oddie of Nevada. Note: Boulder Dam was officially renamed Hoover Dam in 1947.