Record Details

Deepest Hole at Base of Grand Coulee Dam

Washington State University Libraries

Field Value
Title Deepest Hole at Base of Grand Coulee Dam
Description This is a view of the deepest hole in bedrock on the east side; 120 feet deeper than average bedrock surface, and 175 feet below low water level of the river (935)". These deep fissures in the bedrock were filled with a dense, sticky clay deposit composed of extremely fine glacial flour. This material was very difficult to remove from the rock surface, requiring much hand work and many washings. Following debridement these faulted zones were heavily pressure grouted. The first concrete... While excavating an ancient fault line in the eastern portion of the Columbia River several slides occurred that threatened to bury the excavated fault line. On April 22, 1936 500,000 yards of earth shelved off and fell into the gorge being excavated at blocks 68-69. Following another smaller shelving of 20,000 yards in 1937 the fault was completely excavated down to final elevation of 761.5 ft., or about 175 feet below the normal elevation of the river.
Relation Part of Western Waters Digital Library: http://harvester.lib.utah.edu/wwdl/; Photographer Unknown
Creator Clifford R. Koester
Subject Excavation--Washington (State)--Grand Coulee Dam; Grouting--Washington (State)--Grand Coulee Dam Excavation
Type Photograph
Coverage United States--Washington (State)--Grant County--Grand Coulee Dam site, Grand Coulee Dam (Wash.)
Identifier 709b1v2p157.jpg http://kaga.wsulibs.wsu.edu/u?/koester,1014
Publisher Manuscripts, Archives, and Special Collections, Washington State University Libraries: http://www.wsulibs.wsu.edu/holland/masc/masc.htm
Source A History of the Columbia Basin Project (Vol. 2, Page 157)-Cage 709: Clifford R. Koester Papers, 1927-1972: http://www.wsulibs.wsu.edu/holland/masc/finders/cg709.htm
Rights 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.
Format 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
Language English
Date 2008

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