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176 - 200 of 251 Items << < 3 4 5 6 7 8 9 10 11 > >>
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"2419 Boulder Dam. November 7th, 1933.
2428 Boulder Dam. (Note 10 ft. diameter Power House Gallery forms being installed.) November 22nd, 1933."
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"2638 Interior view of Power House block A-7, showing reinforcing steel and pipe layout. April 25th, 1934.
2660 Looking upstream in Black Canyon, showing general view of the Power House layout, taken from the Nevada
Valve House bench....
2024-05-05
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"2993 Form work on the Nevada Valve House bench. January 2nd, 1935.
2971 Telephoto view of Nevada Powerhouse units. December 19th, 1934.
2995 Arizona Valve House from the center of the low catwalk. January 2nd, 1935
2973 Telephoto view...
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"3512 Looking upstream in the Arizona Valve House. Note three gates and needle valves have been installed. October 29th, 1935.
3497 View from the top of Boulder Dam, looking toward the Power House, Valve Houses and lower portals of the...
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"2713. Boulder Dam, looking upstream from the Nevada side. May 31st, 1934.
2698. Looking upstream toward the upper plug and raise, in Diversion Tunnel No. 3. May 25th, 1934.
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In 1931, Utah joined Six Companies Inc. to raise the surety required to bid for the Boulder (Hoover) Dam contract. One of the world’s largest dams, Hoover Dam was completed in 1936 at a cost of $49 million. These scrapbooks document through...
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"1782 Head Towers for Cableways Nos. 5, 6, 7 and 8, taken from the Arizona side, and showing steel trestle.
November 29th, 1932.
1768 View showing Head Tower for No. 8 Cableway. November 29th, 1932.
1780 Tail Towers for Nos. 7 and 8...
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"1853 Close-up view, showing excavation operations on the Nevada abutment of Hoover Dam. January 14th, 1933.
1901 High scaling activities, in connection with the excavation on the Nevada abutment to Hoover Dam. January 27th, 1933.
1861...
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"2260 Nevada Spillway, looking upstream. June 27th, 1933.
2242 Lower Portals of Diversion Tunnels, discharging 73,000 cubic feet per second flow into Colorado River.
June 16th, 1933.
2259 Arizona Spillway, looking upstream. June 27th,...
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"1647 Nevada Inclined Spillway Tunnel leading down into Diversion Tunnel No. 1. September 28th, 1932.
1515 Building fill, Arizona side, on which Tail Towers of Cableway No. 5 and No. 6 will run. August 29th, 1932.
1623 Arizona side of...
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"1411-1412 These pictures together with the two on the opposite page, form a panorama of operations being carried on at the canyon rim, on the Nevada side. Photograph was taken from the Arizona spillway site. To the left is shown the Black...
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"1588 View of Upper Portals of Diversion Tunnels No. 1 and No. 2 from Arizona side. September 9th, 1932.
1610 Upper Portals, showing temporary Trestle and Dyke in upper Cofferdam area. September 17th, 1932.
1662 Upstream Cofferdam progress....
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"1495 Interior of one of the diversion tunnels, showing panel of concrete lining being poured in the invert section of the tunnel. Side wall tunnel form is shown in the background. August 24th, 1932.
1479 Section of finished diversion...
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A pamphlet printed June 19, 1931 for use at exhibits, meetings, and general distribution regarding the Colorado River Aqueduct and the Boulder Canyon Dam.
1931-06-19
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Scale [ca. 1:221,760. 1 in. to approx. 3.5 miles] ; 1 map : col. ; 51 x 62 cm ; Relief shown by contours and spot heights ; "Prepared in Washington Office from compilation made in Las Vegas Office." ; "Map no. 24000." ; Includes township and range...
2024-05-05
2024-05-05 |
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"Report of Colorado River Board on the Boulder Canyon Project" and attached press release comparing the merits of constructing a dam on the Colorado River in Boulder Canyon or Black Canyon
2024-05-05
2017-07-12 2017-07-12 |
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Two unidentified men in a small boat on the Colorado River, looking downstream toward the potential site for the Boulder Canyon Dam.
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"1378 Fabricated steel forms for placing the 3-foot thick lining in the side wall section of the diversion tunnels being erected outside the upper portal of Diversion Tunnel No. 1. July 23rd, 1932.
1381 Apparatus devised for drilling grout...
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"# 539 steam Locomotive hauling muck train from the dump hopper at the low level mixing plant for the disposal of tunnel muck along the right-of-way above the river-camp, which is seen in the background. January 28th, 1932.
#537 Four 90-ton...
2024-05-05
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"# 414 Shovel being transported across the river on
a barge to commence the operations of enlarging the tunnels from their twelve by twelve topheadings, shown in the picture, to their full diameter. October 27th, 1931.
# 597 Same as # 414....
2024-05-05
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"# 672 View of truck depot on the Nevada side of the river, near the upper portals of the Diversion Tunnels. The upper Arizona portals are shown across the river in the background. December 13th, 1931.
# 741 A general view, looking...
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"#119 U. S. Government Railroad and
Highway - leading to Dam Site -from Hoover Point. Sept. 3, 1931.
#186 California-Nevada Power Co., Substation, near Dam-site. Government Railroad and Government Highway from Boulder City to...
2024-05-05
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"A page of Boulder City views, showing some of the buildings erected by Six Companies Inc.
# 750 View of Dormitory #5. Eight similar dormitories
have been erected, each building housing 172 men in individual rooms. All buildings are...
2024-05-05
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"#22 - No. 1, Marion Electric Shovel Loading Trucks, Lower Portal No. 1 Tunnel, July 6, 1931.
#24 - Drilling for Rock Excavation, Lower Portal No. 2 Tunnel. July 6, 1931.
#19 - No. 3 Compressor Plant, June 25, 1931.
#20 - No. 3 Compressor...
2024-05-05
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"#29 - Nevada Adit and Middle Suspension Bridge---June 30, 1931.
#27 - Conway Mucking Machine Loading Cars
at the Upper Portal, R. R. Tunnel #1. June 30, 1931."
2024-05-05
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