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1051 - 1075 of 1090 Items << < 38 39 40 41 42 43 44 > >>
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The intake towers stand in the middle of the photo. The level of the rising water is over two-thirds full. The spillway on the Nevada side is in the foreground. The spillway on the Arizona side is in the background. The top of the dam is visible...
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View of Hoover Dam from downstream on the Colorado River in Black Canyon. The central power house is seen at the base of the dam face. Water is being discharged from outlet works of the valve houses on both the Nevada and Arizona sides of the...
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A view of the construction on the walls of Black (not Boulder)Canyon. There appears to be several tunnels dug into the canyon walls. Construction workers are standing on scaffolding in the left foreground of the picture. A track constructed of...
2024-04-26
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Panoramic view looking upstream toward Hoover Dam reservoir. Mountains are visible in the background.
1935-07-25
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A view of railroad tracks on the side of the mountain leading into a tunnel in the background. Both walls of the canyon are visable and the Colorado River is flowing through the bottom of the canyon. In the foreground of the left side of the...
2024-04-26
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Construction workers using construction equipment to drill railroad tunnels.
2024-04-26
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This picture shows a concrete mixing plant on the river bank at the Hoover Dam construction site in Black Canyon. It was taken with a telephoto lens.
1932-03-28
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A side-dump car from the gravel pits is dumping gravel into a depressed track hopper at the gravel plant. Train and buildings are visible. An employee is watching the process.
1932-03-19
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Letters primarily written by Delph Carpenter regarding Boulder Canyon Project negotiations and the Boulder Canyon Project Act. Folder includes a copy of H.R. 5773, "An act to provide for the construction of works for the protection and development...
2007-01-02 2007-01-02 |
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Five reports written by R. E. Glover on experiments in cooling concrete and preventing damage to dams from boulders
2007-01-02 2007-01-02 |
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Letters from Utah Congressman E. O. Leatherwood assuring Delph Carpenter that he would guide Colorado legislation through Congress, an editorial by Carpenter in one of Arizona's newspapers arguing that not all power from the Hoover Dam should be...
2007-01-02 2007-01-02 |
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Report entitled "Temperature Movements in Concrete and Other Materials, with Special Reference to Conditions at Boulder Dam" by R. E. Glover
2024-04-26
2007-01-02 2007-01-02 |
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"1283 Looking into the open cut excavation for the Arizona spillway. June 21st, 1932.
1282 A similar view to No. 1283 on the left, taken from a greater distance, showing the muck roads and spoil dumps.
June 21st, 1932.
1291 Looking across...
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"1245 At the head of Las Vegas Wash, which flows into the Colorado River a few miles above the damsite, are many queer and interesting rock formations. June 5th, 1932.
1242 Erosion caused by wind and water have fashioned rocks into fantastic...
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"# 745 Drilling Jumbo in operation in the face of one
of the Diversion Tunnels. From 20 to 25 drills can be operated at once and one-half of the face drilled in one operation. December 8th, 1931.
# 671 View of the drilling Jumbo taken...
2024-04-26
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"# 623 View looking upstream from point near the
Government water intake on the Nevada side. The lower portals of Diversion Tunnels Nos. 2, 3 and 4 are shown. The bridge in the foreground, in addition to being a footbridge, carries a...
2024-04-26
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"#326 - Lower Portal of No. 2 Diversion Tunnel after first shot in enlarging from 12'x 12' top heading to full size. October 13, 1931.
#422 - Same view as above October 28, 1931.
#327 - Lower Portal of No. 3, Diversion Tunnel after first...
2024-04-26
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"# 641 Indicative of the wide range of temperature
at Boulder City, which reaches 115 in the summer. shows what was officially
summer, this view shows what was in seventeen
reported as the third snow-storm in seventeen
years. The...
2024-04-26
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"#40 - Railroad Tunnels, Government Railroad to Damsite. August 8, 1931.
#41 - Hemenway Wash & Six Companies' Railroad Grade to Junction City. Aug. 8, 1931.
#42 - Showing Location of Proposed Gravel Plant at Junction City & Six...
2024-04-26
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"#44 - Railroad Grade between Gateway
and Cape Horn. August 8, 1931.
- River Camp August 6, 1931.
#46 - Insurance Company Signs near River Camp. Aug. 9, 1931.
#47 - Six Companies' Railroad -Grading below Cape Horn. August 9,...
2024-04-26
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"#68 - The Sierra-California Power Company, substation above Damsite. August 7, 1931.
#69 - Government lumping Plant at Colorado
River - To Pump Water for Boulder City. August 7, 1931.
#70 - Approach Cut, Lower Portals, Diversion Tunnels...
2024-04-26
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"2934 Looking upstream in No. 1 plug, showing the gunited portions of the arch and raise into the Nevada Spillway. November 17th, 1934.
2935 Looking upstream into No. 3 plug and raise, showing plug concrete in place, cooling headers above and...
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"2455 Looking upstream through Black Canyon showing Boulder Dam under construction. December 15th, 1933.
2473 Close-up of Boulder Dam, looking downstream. December 27th, 1933.
2480 Nevada Spillway Weir. December 27th, 1933."
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"2727 Downstream face of Boulder Dam, taken from Lookout Point. June 16th, 1934.
2743 Looking down the transition into No. 4 Raise. June 21st, 1934.
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"2386 Concreting equipment in No. 1 Inclined Spillway Tunnel. October 7th, 1933.
2363 Boulder Dam, looking upstream. September 30th, 1933."
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