Description provided on front of image: "Boulder Dam Power House-Nevada wing."

Gravel plant at Lawler near dam site.

Water tanks and upper batch plant for cement. Note on back: ""Trains took cement from this plant down to the dam site. - W. A. Davis.""

Circa March 6, 1931, cable on earth shovel broke. Note on back: ""Photo sent to Robling Steel Co. who used it in one of their magazine articles. - W. A. Davis, 1992.""

From the UNLV Libraries Single Item Accession Photograph Collection (PH-00171)

This photograph has three images. The first one, (0272_0014) reads, "Train load of gravel coming in three shay engines used for this load. Gravel comes from downstream of Boulder Canyon," as a handwritten inscription. The second one (0272_0015) that's upside down reads "March 9, 1934. New Union Pacific Train arrives at Boulder Dam." The third one (0272_0016) that's vertical shows the top workings on Boulder Dam from NV rim of Black Canyon (U.S. Bureau of Reclamation photo). It reads, "Top of dam about one form wide, everyone getting in each others way. '(0)' shows how much the slant of the dam has shortened the pours - form raisers have this one in place, waiting for carpenters to build the short side panels. (x) points out upstream face panels - form raisers nightmare, water soaked and patched up, very leery of climbing out, and straddling that lower 2x6 and start unbolting the panel. Notice the hand rails on other panels, but nothing to protect you from walking off the most thrilling fall of your life. Reeves often would (when we were safely out of sight, sitting astride a 2x6) he would sling out a bolt, and wait that long, long minute before it hit bottom. And say, 'Boy,' I'd hate to fall that far.' To be continued."

A view of an unidentified man and a piece of machinery at the initial rock opening of the Hoover Dam diversion tunnel.