The first official Bureau of Reclamation car to cross Hoover Dam (then Boulder Dam). Standing from left to right, the men in this picture are identified: Walker R. Young, James Cashman, Frank T. Crowe, and Walter R. Bracken.
Caption at bottom of image reads: "Boulder Dam- downstream face and Nevada lookout point with Fortification Mountain in the background." Boulder Dam was officially re-named Hoover Dam in 1947.