Postcard with an illustration of men working by the entrance a diversion tunnel. The caption reads: "Entrance to of one of the four 56 foot diversion tunnels."
Bridge to gravel pit from Nevada to Arizona about 10 miles up from dam. Note on back: "Railroad went across bridge, not completed in this photo. - W.A. Davis."
Before completion of cofferdam on Colorado River. Canyon showing start of fill for cofferdam. Oct 3, 1932. Note on back: ""Crowding river over prior to installation of Coffer Dam. Then diverted river through diversion tunnels. - W. A. Davis.""
Cofferdam (upper one), 1/4 - 1/2 mile upstream from Dam site. Dec. 25, 1932. Note on back: ""Electric Marion steam shovel on top of cofferdam. May have used shovel to lay down metal grating. - W. A. Davis.""
From the UNLV Libraries Single Item Accession Photograph Collection (PH-00171). Property of Walker R. Young, Construction Engineer; see documentation in Walker biography file.