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No Caption: A 1935 three-cent U.S. Postage stamp, featuring Boulder Dam, now known as Hoover Dam, which was constructed between 1931 and 1936. The concrete arch-gravity dam is located in the Black Canyon of the Colorado River on the border between Clark County, Nevada, and Mojave County, Arizona. A National Historic Landmark, the dam provides hydroelectric power, water storage, flood control, and recreation at Lake Mead, the reservoir created by the dam's construction.
Date: 1935
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Caption: "General View - Night," at the Panama-Pacific International Exposition.
Date: 1915