Parabolic Arches
Title
Parabolic Arches
Description
The parabolic arches of the dam bridge have a clear span of 135 feet and a rise of 17.25 feet . Each arch barrel varies in thickness from 3 feet at the abutments to 18 inches at the crown , and is 30 feet 2 inches wide. " When these arches were poured they were divided into seven sections numbered 4 , 2 , 3 , 1 , 3 , 2 , 4 from one end to the other , and the sections poured in numerical sequence . This was to facilitate curing , and also to assure that each section of the span assumed its permanent shape and due proportion of the load. " A lattice work composed of more than a million and a half board feet of heavy timbering filled the drum gate bays during these final concreting operations. " In the foreground is Frank B . Pomeroy , a U.S.B.R . photographer in action .
Notes
Part of Western Waters Digital Library : http://westernwaters.org/; Photographer Unknown
Author
Koester , Clifford R .
Library of Congress Subject Headings
Bridges--Columbia River; Bridges--Foundations and piers--Design and construction; Highway Bridge--Columbia River; Timber cribs--Railroad bridges--Columbia River; Timber cribs--Highway bridges--Columbia River
TGM Subject
Railroad bridge Vehicle bridge Pedestrian Bridges
Type
Photograph
Geographic Area
United States--Washington (State)--Grant County--Grand Coulee Dam site, Grand Coulee Dam (Wash.)
Identifier
709b1v3p328-B.jpg
Publisher
Manuscripts, Archives, and Special Collections, Washington State University Libraries: http://www.libraries.wsu.edu/masc/masc.htm
Source
A History of the Columbia Basin Project (Vol. 3 , Page 328-B )-Cage 709 : Clifford R. Koester Papers , 1927-1972 : http://www.libraries.wsu.edu/masc/finders/cg709.htm
Reproduction
To order a reproduction please see: http://www.libraries.wsu.edu/masc/ , or contact Washington State University Libraries, Manuscripts, Archives, and Special Collections: (509) 335-6691.
Rights
For permission to publish please contact Washington State University Libraries, Manuscripts, Archives, and Special Collections: (509) 335-6691.
Digital 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
Rating
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