A flashlight photograph of the interior of one of the diversion tunnels. The drilling jumbo is working at the tunnel face. The 12' by 12' top-heading can be plainly seen. January 28, 1932.

One of the drilling jumbos ready for action. This view was posed outside the tunnel, just as the swing shift was ready to go to work on the upper portal of Diversion Tunnel #1. January 28, 1932.

Looking up Black Canyon from a point below all the lower portals, showing the Government pumping plant (lower left), the Six Companies' compressor plant (middle left), the location of the lower portals, & the highway loop above the canyon wall (upper center) - 7/30/31.

p.16 #1074 Scaling down canyon wall, in excavation for intake tower on Nevada side. Apr. 1, 1932. p.16 #1073 Close-up of No.1074 to the left. Workmen are 700 feet above river. Apr. 1, 1932.

Pg.44 #2776 Close-up of No. 3 Arizona Intake Tower, showing the cylinder gates being placed. July 24th, 1934. Pg.44 #2775 Close-up of the Arizona Intake Towers, from the High Catwalk. July 24th, 1934.

Pg.84 #3358 Looking upstream toward Boulder Dam and the Power House. July 25, 1935. Pg.84 #3362 Looking toward the Power House and Valve Houses, from top of Boulder Dam. Jul. 25, 1935.

Pg.1 #2262 Hoover Dam. June 27, 1933. Pg.1 #2256 Cut-off trench at upstream side of Hoover Dam. June 23rd, 1933. Pg.1 #2263 Hoover Dam. June 27th, 1933.