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
http://rightsstatements.org/vocab/NKC/1.0/
Rights Notes
No known copyright. Item is in public domain as it was created by United States government.
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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