From the UNLV Libraries Single Item Accession Photograph Collection (PH-00171). Inscription on image reads, "Powerhouse and downstream face of Boulder Dam. U.S. Bureau of Reclamation photo."
A-1 unit in Arizona wing of Boulder Dam powerhouse. Written with the image: "Started prodA-1 unit in Arizona wing of Boulder Dam powerhouse. Started producing power 10/12041 minus finish work of any kind." (photo by Bill Russell, USBR photographer from cab of upstream crane 300 ton.)
Ray Lyman Wilbur drives the final silver spike into the ground at the railroad junction of Salt Lake RR at Boulder. Other men gather around as spectators, all wearing suits and ties.