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 image showing a bird's eye view of cars driving on the crest of Hoover Dam. The text on the lower left corner of the image reads: Boulder Dam. Boulder Dam was officially renamed Hoover Dam in 1947.
The filling of the Hoover Dam after the completion of the construction. It was previously called the Boulder Dam, and in 1947 it was officially renamed the Hoover Dam. Written on the top of the photo: "BDRA. NEV. 4.36 350." Site Name: Hoover Dam (dam)