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1026 - 1050 of 1119 Items    << < 37 38 39 40 41 42 43 44 45 > >> 
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"1541 Lower Portals of Diversion Tunnels No. I and No. 2, during flash rise in the River. August 31st, 1932. 1542 Lower Portals of Diversion Tunnels No. 3 and No. 4, during flash rise in the River. August 31st, 1932. 1546 Closeup of Lower...

"1630 Bulkhead Gate during construction at Upper Portal of Diversion Tunnel No. 1. September 22nd, 1932. 1632 Bulkhead Gate during construction at Upper Portal of Diversion Tunnel No. 1. September 28th, 1932. 1635 Bulkhead Gate construction...

In Nov 1967, a Deep Water Isotopic Current Analyzer (DWICA) was used to study current patterns in the Boulder Basin of Lake Mead to determine if low-quality water from Las Vegas Bay might enter the Southern Nevada Water Project intake on Saddle...
1971-10-01
A booklet regarding the Boulder Canyon Dam and the proposed benefits of the project. The dam would provide hydroelectric power, flood control, and water access for Southern California.

A book about the history of the Colorado River as well as the future plans for the river such as the Boulder Canyon Dam and the Colorado River Aqueduct.

Newspaper clipping that quotes the entire text of the Kettner Bill.

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
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
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
Report entitled "Temperature Movements in Concrete and Other Materials, with Special Reference to Conditions at Boulder Dam" by R. E. Glover
2020-12-04
2007-01-02
2007-01-02
'F.V. Owen, publisher ... Los Angeles, California. Topography by C.H. Fenner, C.E. Decorations by L.J. Bergère. Gov't. data, H.A. Shamberger, C.E. Copyright, 1930, by F.V. Owen.' At bottom right of map: 'Dated Oct. 7th, 1930.' Relief shown by...
1930-10-07

Pamphlet discussing whether or not Hoover Dam should be built and the allocation of Colorado River water and of the power that the dam would produce. Contains several maps.
2020-12-04
Aerial view of Hoover Dam and the surrounding area showing Lake Mead (the reservoir). The intake towers are visible behind the dam and watr is flowing from the outlet works.

View of Hoover Dam and the Colorado River in Black Canyon. Water is being discharged from the outlet works of the Arizona valve house on the right. The peaks of the intake towers can be seen behind the dam face. Fortification Hill is seen in Black...

View of water being discharged into the no. 1 diversion tunnel. A series of bundled pipes is visible on the right side of the tunnel wall.
1935-03-26
This photo shows trucks and equipment used for hauling and pouring concrete to form the invert lining in a diversion tunnel at Hoover Dam. Also shows some construction workers.
1932-04-11
Construction workers are operating machinery (agitators) which dump concrete into buckets. Location is the interior of a diversion tunnel at the Hoover Dam construction site.
1932-03-23
Construction workers are using a power shovel and trucks to open up an adit as part of the construction of Hoover Dam.
1932-03-18
Memoranda, including "Welding details which can cause high stress concentrations," "Technical Memorandum No. 319 - Comparison of Penstock Theory and Model Test Results," "Moment and Shear due to a Concentrated Load near the Edge of a Slab,"...

2016-03-10
2016-03-10
Speech for unveiling of a plaque at Hoover Dam commemorating the dam's 40th anniversary and the bicentennial of the American Revolution
1976-10-26
2007-01-02
2007-01-02
Correspondence and memoranda, including "Required Experimental Data on Earthquake Ground Motion," "Program Evaluation - Seismological Field Survey," "Special meeting on April, 1955," "Earthquake Laws in the United States," "Use of Intensity...

2016-03-10
2016-03-10
"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
2020-12-04
2017-07-12
2017-07-12
"1217 Placing the steel form for the first pouring of concrete in lining the arch section of the diversion tunnels. View shows upper portal of Diversion Tunnel No. 4. June 2nd, 1932. 1234 Detail view of construction of steel form for...

"1219 The interior of Diversion Tunnel No. 3, near the upper portal. The invert and side wall sections of the three-feet thick concrete lining have been poured. June 2nd, 1932. 1220 The interior of Diversion Tunnel No. 2, near the upper...

"A page of views of Govenment buildings under construction at Boulder City. # 772 The Administration Building, which will bouse the administrative offices of the Bureau of Reclamation during the life of the project. The basement contains a...
2020-12-04
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