This photograph has three images. The first one (0272_0101) depicts a typical dam worker's home. It has a handwritten inscription that reads, "For Sale: former 'dam worker's' home." The second one (0272_0102) shows a billboard outside of Las Vegas, circa late 1930s. It reads "Las Vegas, Nevada. Gateway to world's greatest engineering project - Boulder Dam." The third image (0272_0103) shows the Boulder Dam and reads, "Finished" (duplicate of Image 0272_0097).

Valve house outlet in operation at Hoover Dam.

Black and white image of the main construction site from the downstream side of Hoover (Boulder) Dam.

This photograph has three images. The first one, (0272_0035) shows people high scaling Boulder Dam. The handwritten inscription reads, "The Blackbirds drilling holes for blasting. High scalers, tough job. No chance to sleep here unless you want a long nap. 'Blackie', the graveyard shifter, tells me when he was working the drill from a bo'sn chair. He caught a man who had fallen out of his chair. Had a little too much of on the rocks. Some did fall without any help." The second image (0272_0036) shows the last big blast at Boulder Dam. (Provided by U.S. Bureau of Reclamation) It reads, "Blasting walls of canyon for keyway." The third one (0272_0037) is a picture of Coffer dam at Boulder Dam. The inscription reads, "Steel beams pile driven, rock filled and covered with reinforced concrete. Note size of trucks (at this time, largest in the world) in front of largest 'drilling jumbo' in the world also. There's six working levels on each side for men to work from, and is forty ft. long. About fifty men, each with a tender, works on this jumbo."

An image of the Winged Figures of the Republic statues at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image showing the beginning of a 5000-hole dynamite blast in Black Canyon at the site of Hoover Dam construction. Note: Boulder Dam was officially renamed Hoover Dam in 1947.