A comparison of an image of Hoover Dam's upstream face in February 1935 to an image taken later that year, after the waters of Lake Mead had risen. The captions read "February 1935- Boulder Dam today." Boulder Dam was officially re-named Hoover Dam in 1947.
Caption on right of postcard reads: "The highway across the crest of Boulder Dam from the Arizona side." Boulder Dam was officially re-named Hoover Dam in 1947.