Colorado River-Hoover Dam. Dam and powerhouse construction from book: Boulder Dam of the Great Southwest by Ralph B. Simmons' 1936. Inscription reads: "Below the massive wedge of concrete showing the power house rising against the hard rock walls of Black Canyon." Site Name: Hoover Dam (dam)
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)
Colorado River, Lake Mead. Stone wall built by CCC enrollees at Observation Point. Boulder Dam Recreation Area. Memorial to Dr. Mead in right center. 12/11/36. (with neg.) Site Name: Hoover Dam (dam)
Colorado River, Lake Mead. Island built by CCC enrollees in parking area at Observation Point. Boulder Dam Recreation Area. 12/11/36 (with neg.) Site Name: Hoover Dam (dam)