Caption at bottom of image reads: "Night view of Boulder Dam as the visitors see it from the Nevada lookout point." Boulder Dam was officially re-named Hoover Dam in 1947.

A view of the Winged Figures of the Republic at Hoover Dam; the inscription at the base of the flagpole is printed on the postcard: "It is fitting that the flag of our country should fly here in honor of those men who , inspired by a vision of lonely land, made fruitful, conceived this great work, and of those others whose genius and labor made that vision a reality."

Caption on postcard reads: "The visitor's gallery inside Boulder Dam." Boulder Dam was officially re-named Hoover Dam in 1947.

A view of visitors boarding an elevator on "[the] Highway on crest of Boulder Dam, with elevator tower where visitors are conducted by guides to powerhouse." Boulder Dam was officially re-named Hoover Dam in 1947.

Caption on postcard reads: "Boulder Dam from above the Arizona spillway." Boulder Dam was officially re-named Hoover Dam in 1947.

Caption at right of image reads: "The downstream face of Hoover Dam from the Nevada lookout point." Boulder Dam was officially re-named Hoover Dam in 1947.

A comparison of the Upper Colorado River in 1934 and Lake Mead after the dam's opening, likely in the late 1930s.