A colored postcard showing an artist's representation of the construction site of Hoover Dam, previously known as Boulder Dam, 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. Transcribed onto the top border of the image: "Black Canyon, Boulder Dam Site."
An aerial view of the Hoover Dam after construction. Two unidentified women can be seen in the forground, along with two water intake towers in the background.
Black and white image of concrete being placed into the side walls of diversion tunnel #4 at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.