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."
Text on front of post card: "New Union Pacific Station, Las Vegas, Nevada; Gateway to Boulder Dam; Copyright Boulder Dam Service Bureau." Text on back of postcard: "The new passenger depot of the Union Pacific in Las Vegas, Nevada, is the world's first streamlined, completely air-conditioned railroad passenger station. Typically modernistic western in motif, the structure has been described by architects as one of the most beautiful in design and superlatively complete in appointments, in the United States. Desert Souvenir Supply, Boulder City, Nevada."
Hand-painted postcard showing an upstream view of Boulder (Hoover) Dam. Text on front of postcard: "Boulder Dam at Night"; Text on back of postcard: "Boulder Dam is the highest in the world, rises 727 feet above bed rock. It is 650 feet thick at the base, and the 45 foot crest forms a highway bridge from wall to wall of the gorge, 1180 feet in length, connecting transcontinental traffic arteries between Kingman, Arizona and Boulder City, Nevada. The view of the Dam at night is a most impressive spectacle."