A colored postcard portraying an artist's rendering of a Hoover (Boulder) Dam interior. Printed on the top border of the card: "Entrance to one of the four 56 foot diversion tunnels, Boulder Dam Project." Handwritten text on back of card.
A view of visitors boarding an elevator on "[the] Highway on crest of Boulder Dam, with elevator tower where visitors are conducted by guides to powerhouse." Boulder Dam was officially re-named Hoover Dam in 1947.
This photograph has three images. The first one (0272_0078) reads "'Form Raising Crew' - cont. - Whitie, Indiana 'Hoosier', lining the bolt up from inside. Always looking for a hammer, or bar, when it was time to climb over the top." The second one (0272_0079) reads, "Drilling jumbo in mouth of spillway tunnel," as a handwritten inscription. The third image (0272_0080) reads, "Nevada spillway with flood gates lowered. Notice size of man in gates. Constructed to prevent flood waters from overflowing dam. Each spillway - capable of passing 200,00 cu. ft. per second."