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File:CUSHMAN -1 CONCRETE SPILLWAY RAMPS PLAN AND DETAILS. January 1981. Revised in June 1981. Reference No. BA-081 - Cushman No. 1 Hydroelectric Power Plant, Spillway, North Fork HAER WASH,23-HOPO.V,1-A-24.tif

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CUSHMAN -1 CONCRETE SPILLWAY RAMPS PLAN AND DETAILS. January 1981. Revised in June 1981. Reference No. BA-081 - Cushman No. 1 Hydroelectric Power Plant, Spillway, North Fork of Skokomish River, 5 miles West of Hood Canal, Hoodsport, Mason County, WA
Title
CUSHMAN -1 CONCRETE SPILLWAY RAMPS PLAN AND DETAILS. January 1981. Revised in June 1981. Reference No. BA-081 - Cushman No. 1 Hydroelectric Power Plant, Spillway, North Fork of Skokomish River, 5 miles West of Hood Canal, Hoodsport, Mason County, WA
Description
Stannard, J L; Bone, Homer T
Depicted place Washington; Mason County; Hoodsport
Date Documentation compiled after 1968
Dimensions 8 x 10 in.
Current location
Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print
Accession number
HAER WASH,23-HOPO.V,1-A-24
Credit line
This file comes from the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER) or Historic American Landscapes Survey (HALS). These are programs of the National Park Service established for the purpose of documenting historic places. Records consist of measured drawings, archival photographs, and written reports.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

Notes
  • Significance: The Cushman No. 1 Hydroelectric Power Plant is a significant example of medium head hydroelectric technology in the west from the 1920s. Located in steep, inaccessible terrain prone to flooding, the plant construction was a significant engineering feat and used a revolutionary design for the time, a constant angle concrete arch dam, for the steep, narrow gorge in which it is located. When completed in 1925, the dam formed a lake 9.6 miles long, covering 4,000 acres, which was the largest reservoir in the Pacific Northwest and the tenth largest in the United States. The spillway is unusual for its converging chute design. It also is notable for hydrologic patterns (standing waves) that develop during spills and which result from the converging design of the structure.
  • Survey number: HAER WA-26-A
  • Building/structure dates: 1929 Initial Construction
  • Building/structure dates: ca. 1930 Subsequent Work
  • Building/structure dates: 1981 Subsequent Work
Source https://www.loc.gov/pictures/item/wa0270.photos.168462p
Permission
(Reusing this file)
Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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