A colored postcard showing an artist's representation of a small boat sailing on the upstream face of Hoover Dam, previously known as Boulder Dam, in Black Canyon. Transcribed onto the top border of the image: "Upstream Face And Intake Towers, Boulder Dam."

A colored postcard showing an artist's representation of water flowing over the spillway gates from Lake Mead into Hoover Dam, previously known as Boulder Dam, in Black Canyon. Transcribed onto the top border of the image: "Lake Mead Flowing over Spillway Gates, Boulder Dam."

A colored postcard showing an artist's representation of The Babcock and Wilcox Pipe Plant next the construction site of Boulder Dam, a title that would later be changed to Hoover Dam. Because the penstock pipes at Hoover Dam were too large to be carried over railroads, this plant was built to fabricate the largest penstock pipes in the world. Transcribed onto the top border of the image: "The Babcock & Wilcox Pipe Plant, Boulder Dam."

A colored postcard showing an artist's representation of an 150 man transport for the Boulder Dam, later renamed Hoover Dam, project in Black Canyon. Transcribed onto the top border of the image: "150 Man Transport, Boulder Dam Project."

A colored postcard showing an artist's representation of the downstream face of Hoover Dam and the Lake Mead Recreational Area in Black Canyon. Constructed in the 1930s, Hoover Dam crosses the Colorado River on the state line between Arizona and Nevada. Also considered to be an engineering wonder and the world's largest dam during its time of construction, Hoover Dam provides much-needed irrigation and hydroelectric power to the Southwest region of the United States. From this angle, intake towers can be seen sticking out of Lake Mead, along with the U-shaped power house at the base of the dam. Transcribed onto the bottom of the image: "Lake Mead Recreational Area."

A colored postcard showing an artist's representation of Boulder Dam, later known as Hoover Dam, in Black Canyon, with Fortification Mountain lying in background. From this angle, intake towers can be seen sticking out of Lake Mead, along with the U-shaped power house at the base of the dam.

An aerial view of Hoover Dam.