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Coulee Dam Bridge

Okanogan County, Washington, and Douglas County, Washington
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Coulee Dam Bridge

Side elevation from the northeast

Photo taken by Mike Goff in May 2012

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Facts 

Overview
Through truss bridge over Columbia River on WA 155 in Coulee Dam
Location
Coulee Dam, Okanogan County, Washington, and Douglas County, Washington
Status
Open to traffic
History
Built 1935
Builders
- J.H. Pomeroy of San Francisco, California (Superstructure Contractor)
- Washington Department of Highways (Engineer)
- Western Construction of Spokane, Washington (Substructure Contractor)
Design
Cantilever steel Warren through truss
Dimensions
Length of largest span: 549.9 ft.
Total length: 1,089.0 ft.
Deck width: 20.3 ft.
Vertical clearance above deck: 14.5 ft.
Recognition
Posted to the National Register of Historic Places on July 16, 1982
Also called
Grand Coulee Bridge
Approximate latitude, longitude
+47.96534, -118.98235   (decimal degrees)
47°57'55" N, 118°58'56" W   (degrees°minutes'seconds")
Approximate UTM coordinates
11/352029/5314350 (zone/easting/northing)
USGS topographic map
Grand Coulee Dam
Inventory numbers
NRHP 82004267 (National Register of Historic Places reference number)
BH 34413 (Bridgehunter.com ID)
Inspection (as of 10/2011)
Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Good (7 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 48.8 (out of 100)
Average daily traffic (as of 2010)
5,375

Categories 

Built 1935 (1,456)
Built during 1930s (8,551)
Cantilevered (242)
Cantilevered truss (222)
Columbia River (35)
Concrete balustrade (425)
Coulee Dam, Washington (1)
Douglas County, Washington (7)
Flared (407)
Functionally obsolete (7,040)
HAER documented (782)
Have street view (9,891)
J.H. Pomeroy (4)
NR-listed (2,354)
Navigable waterway (1,448)
 Okanogan County, Washington (11)
Open (28,316)
Owned by state (9,808)
Riveted (1,011)
Span length 500-1000 feet (313)
Steel grate deck (382)
Through truss (9,209)
Total length 1000-2500 feet (1,215)
Truss (23,573)
Warren through truss (927)
Warren truss (3,960)
Washington (843)
Washington Department of Highways (1)
Western Construction (1)

Update Log 

  • February 11, 2013: Updated by Nathan Holth: Added Builders
  • May 10, 2012: New photos from Mike Goff
  • March 25, 2011: New photos from Michael Goff
  • December 16, 2008: Updated by Michael Goff

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Comments 

Columbia River Bridge
Posted April 26, 2010, by Todd D. Walker (mrwalk08 [at] aol [dot] com)

It seems the further west you go, the better treatment of and appreciation for truss and other notable "non UCEB" bridges is evident. Imangine driving US 101, or the Pacific Coast Highway, and every bridge "an ugly slab of dime a dozen CONCRETE!" It would be TERRIBLE! Back east that "nightmare" is coming true each time demolition companies accept tax-payer dollars.

Columbia River Bridge
Posted April 25, 2010, by Nathan Holth (form3 [at] historicbridges [dot] org)

This is a enormous, magnificent bridge which is dwarfed by the even larger Grand Coulee Dam. By the way, the Grand Coulee Dam also has a large, multi-span open-spandrel concrete deck arch bridge on top.