p.23 #1725 Close-up of upper portal of Diversion Tunnels No. 3 & 4, during preparations for blast. Nov. 13, 1932. p.23 #1728 Close-up of upper portals of Diversion Tunnels No. 3 and 4, showing flow in diversion tunnel No.4, shortly after blast. Nov. 13, 1932. p.23 #1733 Dumping materials at temporary pile bridge to complete diversion of Colorado River. Nov. 13, 1932. p.23 #1737 Upper portals of Diversion Tunnels No. 3 & 4, and temporary dyke, after diversion of Colorado River was completed. Nov. 26, 1932.

Pg.24 #2558 General view of Himix, including Blending Plant silos at left rear of picture. March 1st, 1934. Pg.24 #2543 Looking downstream in lower No. 2 plug, showing form work. Feb. 20th, 1934. Pg.24 #2542 Excavation for bridge abutment in Arizona Spillway. Feb. 29th, 1934. Pg.24 #2539 Close-up of Cooling Pipe Layout in Panel H-3. Feb. 20th, 1934.

Pg.27 #2568 Union Pacific "Train of Tomorrow" on the Lomix Trestle, at the upstream face of Boulder Dam, where the concrete is transferred from Lomix trains to the Dam. March 9th, 1934. Pg.27 #2589 View taken from No. 2 Arizona derrick, showing Nevada Spillway in the background. March 24th, 1934. Pg.27 #2616 Looking upstream in Number 4 raise and plug. March 28th, 1934.

Pg.57 #2963 No.5 Intake Tower finished to Elevation 1232, showing curtain wall. Dec. 5th, 1934. Pg.57 #3009 Telephoto looking downstream into the Arizona Spillway, showing construction of the spillway bridge. Jan. 8th, 1935. Pg.57 #2980 Looking upstream at the upper end of No.1 plug, showing forms for the Intake Transition. Dec. 19th, 1934. Pg.57 #2977 Looking upstream into No.1 plug, showing the placing of the high pressure valves and method of pouring. Dec. 19th, 1934.

Pg.63 #3062 Boulder Dam, looking upstream. Feb. 1st, 1935. Pg.63 #3028 Upstream face of Boulder Dam, looking downstream from the upstream cofferdam. Arizona Intake Towers on left, Nevada Intake Towers to the right. Jan. 28th, 1935. Pg.63 #3038 Looking across the downstream face of Boulder Dam, showing the utility towers and elevator shaft. Jan. 28th, 1935.

Pg.94 #3476 Looking upstream in Nevada Valve House. Note installation of needle valves and gates. Sept. 27, 1935. Pg.94 #3478 Looking upstream, on roof of Nevada Valve House. Steel rails in place, ready for pouring concrete slab. Sept. 27, 1935. Pg.94 #3473 Looking into Arizona Spillway Raise. Jumbo is being used for grouting, back of concrete lining. Sept. 27, 1935.

Pg.98 #3487 Boulder Dam and Powerhouse, looking upstream from lower cofferdam. Oct. 28, 1935. Pg.98 #3500 Boulder Dam Switchyard, showing excavation and construction. Note Boulder Dam Highway in background. Oct. 28, 1935. Pg.98 #3501 Looking upstream in No.2 downstream plug, showing water conduit being placed. Oct. 28, 1935. Pg.98 #3506 Looking upstream toward No.3 downstream plug. Note clean-up operations, getting ready for carpenters. Oct. 28, 1935.