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Oregon City Bridge

Oregon City Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: September 2, 2018

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Key Facts

Facility Carried / Feature Intersected
OR-43 (7th Street, Willamette Drive) Over Willamette River
Oregon City: Clackamas County, Oregon: United States
Structure Type
Metal Solid Ribbed Through Arch, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1922 By Builder/Contractor: A. Guthrie and Company of St. Paul, Minnesota and Engineer/Design: Conde Balcom McCullough (Oregon State Highway Commission)

Technical Facts

Rehabilitation Date
Main Span Length
360 Feet (109.73 Meters)
Structure Length
745 Feet (227.08 Meters)
Roadway Width
18.4 Feet (5.61 Meters)
1 Main Span(s) and 10 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View Historic American Engineering Record (HAER) Documentation For This Bridge

HAER Data Pages, PDF

View Historic Bridge Inventory Sheet For This Bridge

View National Register of Historic Places Nomination Form For This Bridge

View Historical Articles About This Bridge

View Brochure About Bridge Rehab

This is a unique bridge because it looks like a concrete arch bridge, such as a rainbow arch bridge or a Marsh arch bridge. However, it is classified as a steel arch bridge because the concrete that surrounds the solid steel boxes and beams within is simple gunnite (shotcrete) and thus the concrete is not a structural element, but acts more like a coat of paint to protect the steel. Gunnite was used because it was felt it would provide the bridge better protection from the corrosive sulphur dioxide fumes from the paper mills south of the bridge that existed when the bridge was built.

In 2012-2013 a major rehabilitation of this bridge took place. On many parts of the bridge the gunnite was blasted off and replaced in-kind.

Above: Historical Popular Science article showing the construction of the bridge.

Above: Postcard showing the previous suspension bridge at this location.


Photo Galleries and Videos: Oregon City Bridge

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