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Oregon City Half-Viaduct

Oregon City Half-Viaduct

Primary Photographer(s): Nathan Holth

Bridge Documented: September 2, 2018

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Key Facts

Facility Carried / Feature Intersected
OR-99 Over Cliff along Willamette River
Location
Oregon City: Clackamas County, Oregon: United States
Construction Date and Builder / Engineer
1940 By Builder/Contractor: Unknown and Engineer/Design: Oregon State Highway Commission

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
33 Feet (10.06 Meters)
Structure Length
336 Feet (102.41 Meters)
Roadway Width
50 Feet (15.24 Meters)
Spans
11 Main Span(s)
NBI Number
2732

Historic Significance Rating (HSR)

Bridge Documentation

This bridge carries the roadway out over the edge of a cliff along the river. Bridges performing this function are sometimes called a half-viaduct, although with this bridge, the entire width of the roadway is carried out over the cliff on the bridge structure, which is not always the case with a half-viaduct, as the name implies.

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

 

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Photo Galleries and Videos: Oregon City Half-Viaduct

 
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