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Oregon City Bridge


Oregon City Bridge - Post Rehab.

South Elevation - Post-Rehabilitation

Photo taken by Mike Goff in June 2013


BH Photo #256854


Street View 


The Willamette River Bridge (commonly called the Oregon City Arch Bridge) is 745' long with a 360-foot steel through arch of box-girder construction, encased in gunite. The gunite encasement was necessary to prevent corrosion from sulphur dioxide fumes from the paper mills south of the bridge. This is the only gunite-covered bridge in Oregon. The 1921-1922 Biennial Report of the Oregon State Highway Commission praised this bridge as being "the most artistic appearing large bridge in the State."

- Historic American Engineering Record


Steel through arch bridge over Willamette River on OR-43 in Oregon City
Oregon City, Clackamas County, Oregon
Open to traffic
Built 1922, Rehabilitation 2012
- A. Guthrie & Co. of St. Paul, Minnesota (Contractor)
- Conde B. McCullough of Redfield, South Dakota (Bridge Engineer)
- Raymond A. Furrow (Construction Supervisor)
- Wildish Standard Paving Co. of Eugene, Oregon (Rehabilitation Contractor)
The main structural portions of the arch section of the bridge are made of steel. The arch ribs are hollow steel boxes riveted together. These, and the steel floor beams and stringers which support the deck, are encased in a 1-1/2 inch coating of sprayed concrete, called Gunite.
The columns and hangers supporting the deck from the arch ribs are steel sections. The Xshaped cross bracing between the arches are steel trusses. Both of these are encased in solid concrete. The lower arch ribs are connected to appear as a solid spandrel.
Information from ODOT Website
Length of largest span: 360.0 ft.
Total length: 745.0 ft.
Deck width: 19.0 ft.
Vertical clearance above deck: 14.0 ft.
Posted to the National Register of Historic Places on July 1, 2005
Also called
Willamette River Bridge
Approximate latitude, longitude
+45.35903, -122.60969   (decimal degrees)
45°21'33" N, 122°36'35" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/530569/5022909 (zone/easting/northing)
Quadrangle map:
Oregon City
Average daily traffic (as of 2014)
Inventory numbers
OR 00357 (Oregon Dept. of Transportation structure number)
NRHP 05000639 (National Register of Historic Places reference number)
BH 29898 (Bridgehunter.com ID)
Inspection report (as of December 2015)
Overall condition: Fair
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 45 (out of 100)
View more at BridgeReports.com

Update Log 

  • October 17, 2014: New photos from Royce and Bobette Haley
  • March 9, 2014: Updated by Dave King: Added NRHP info & imported photos
  • June 20, 2013: New photos from Mike Goff
  • April 25, 2010: New Street View added by Nathan Holth
  • April 20, 2009: Posted HAER photos
  • February 19, 2009: Updated by Michael Goff
  • August 20, 2008: Updated by Michael Goff
  • July 28, 2008: Updated by Michael Goff
  • June 9, 2008: New photos from Michael Goff

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Oregon City Bridge
Posted October 17, 2012, by Nathan Holth (form3 [at] historicbridges [dot] org)