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Here jackhammer crews are at work on the upper portals of the pumping plant tunnels. Excavation of rock in these discharge tunnels was bid by CBI at $10.00 per cubic yard. In the gravity plan for irrigating the Columbia Basin there was one place that required two parallel tunnels 16 miles long and 32 feet in diameter thru solid basalt rock harder than granite, and to be lined with concrete. The total length of tunnels in the gravity plan was 33 miles, at a cost of about $105,000,000.
Part of Western Waters Digital Library: http://harvester.lib.utah.edu/wwdl/; Photographer Unknown
Clifford R. Koester
Tunnels--Design and Construction--Washington (State)--Grand Coulee Dam; Excavation--Washington (State)--Grand Coulee Pumping Plant; Pumping stations--Design and construction--Washington (State)--Grand Coulee Dam; Concrete--Reinforcing bars--Washington (State)--Grand Coulee Dam
Pumping Plant; Excavation
United States--Washington (State)--Grant County--Grand Coulee Dam site, Grand Coulee Dam (Wash.)
Manuscripts, Archives, and Special Collections, Washington State University Libraries: http://www.wsulibs.wsu.edu/holland/masc/masc.htm
A History of the Columbia Basin Project (Vol. 3, Page 295-A)-Cage 709: Clifford R. Koester Papers, 1927-1972: http://www.wsulibs.wsu.edu/holland/masc/finders/cg709.htm
To order a reproduction please see: http://www.wsulibs.wsu.edu/holland/masc/policies.htm , or contact Washington State University Libraries, Manuscripts, Archives, and Special Collections: (509) 335-6691.
For permission to publish please contact Washington State University Libraries, Manuscripts, Archives, and Special Collections: (509) 335-6691.
Original photographic prints were scanned at 24 bit 3000 pixels by the long side for master TIFF files on an Plustek OpticBook 3600 Plus. Also, 24 bit 150 PPI JPEGs were created with the OpticBook 3600 Plus and added to the CONTENTdm database at the WSU Libraries