p.8 #989 Looking upstream at Black Canyon. Dam will be located just upstream from foot-bridge, at bottom of picture. Entrance to upper portals of diversion tunnels opposite the middle truck bridge. Mar. 12, 1932. p.8 #996 Looking downstream from same point as No.989. Lower portals of diversion tunnels are just below. This picture Presents graphic view of problem of muck disposal. Mar. 14, 1932.

p.9 #1011 Marion electric shovel with 3 1-2 cubic yard rock dipper loading into White 8 cubic yard truck, at Nevada spillway cut. Mar, 18, 1932. p.9 #1014 Mack truck with 14 cubic yard body being loaded at Nevada Spillway cut. Five similar trucks being used on this operation. Mar. 18, 1932. p.9 #1004 White truck dumping near site of Nevada spillway cut and extending road the for muck disposal. Mar. 16, 1932.

Pg.14 #2457 Two-hundred ton two-way trailer, for transporting sections of 30 ft. penstock pipe. Dec. 15th, 1933. Pg.14 #2460 View of 200-ton two-way trailer, with test load. Dec. 15th, 1933. Pg.14 #2481 Excavation for Downstream Plug, Diversion Tunnel No. 3. Dec. 29th, 1933. Pg.14 #2485 Excavation for Downstream Plug, Diversion Tunnel No. 3. Dec. 29th, 1933.

p.14 #1277 Steel forms for lining the arch sections of diversion tunnels were erected on muck-fill on Nevada side of river. Jun. 18, 1932. p.14 #1235 Section of arch jumbo form being transported across river by overhead cableway. Note workman on top of form. Jun. 10, 1932. p.14 #1278 Forms were constructed in 11-foot sections and transported to Arizona side by over head cableways. Jun. 18, 1932.

Pg.83 #3352 - #3353 Panorama, looking upstream toward Boulder Dam reservoir, from Observation Point. July 25, 1935. Pg.83 #3351 Looking downstream toward Boulder Dam, from the Arizona side. July 25. 1935. Pg.83 #3370 View taken from the Nevada side, looking downstream toward Boulder Dam. July 26, 1935.

Pg.26 #2581 Foundation forms for the Arizona Power House, taken from the Nevada Valve House Bench. March 16th, 1934. Pg.26 #2599 Forms for Arizona Power House retaining wall. March 14th, 1934. Pg.26 #2617 Telephoto view of foundation forms for the Arizona Power House, taken from Lookout Point. April 1st, 1934. Pg.26 #2610 View looking into Power House block A-5. March 28th, 1934.

Pg.58 #2993 Form work on the Nevada Valve House bench. Jan. 2nd, 1934. Pg.58 #2971 Telephoto view of Nevada Powerhouse units. Dec. 19th, 1934. Pg.58 #2995 Arizona Valve House from the center of the low catwalk. Jan. 2nd, 1935. Pg.58 #2973 Telephoto view of Arizona Powerhouse units. Dec. 19th, 1934.