Colorado River-Hoover Dam. Diagram of Boulder Dam in construction from book: Boulder Dam of the Great Southwest, by Ralph B. Simmons, 1936. Image taken January 4, 1940. Site Name: Hoover Dam (dam)
"N.E. Johnson, photographer and publisher." Booklet consists primarily of photographs of the Colorado River in Black Canyon, prior to the construction of Hoover (Boulder) Dam, and photographs of people and businesses in early 20th-century Las Vegas.
An image showing a bird's eye view of Hoover Dam from the Arizona side, featuring intake towers. Caption on bottom right of image reads: "Upstream face of Boulder Dam showing intake towers and Arizona observation point. [Copyright] BDSB." Boulder Dam was officially renamed Hoover Dam in 1947.