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Umatilla Bridge

Umatilla Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 23, 2014

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Key Facts

Facility Carried / Feature Intersected
I-82 (Eastbound) and US-295 Over Columbia River
Umatilla: Umatilla County, Oregon and Benton County, Washington: United States
Structure Type
Metal Cantilever Rivet-Connected Warren Through Truss, Fixed and Approach Spans: Metal Pin and Hanger Deck Girder, Fixed
Construction Date and Builder / Engineer
1955 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: Tudor Engineering Company of San Francisco, California

Technical Facts

Rehabilitation Date
Main Span Length
600 Feet (182.9 Meters)
Structure Length
3,380 Feet (1030.2 Meters)
Roadway Width
27.6 Feet (8.41 Meters)
5 Main Span(s) and 15 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

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

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This bridge is a very unusual and distinctive cantilever truss because it includes two spans that each consist of cantilever arms holding a suspended span in the center. Most bridges of this type only have one cantilever arm/suspended span component. To accommodate this unusual design, an equally unusual and short-looking 300 foot span can be found in the middle of the river acting as anchor arms for each of the central cantilever arms that extend from that point. Each cantilever arm is 150 feet long and the suspended span is 300 feet. The truss has an uncommon design that begins as a deck truss and rises to act as a through truss over the channel spans.

Tudor Engineering Company designed the bridge. Austin Construction and Cascade Construction Companies both from Portland, Oregon built the piers and approaches. The American Bridge Company was the steel fabricator.

Today the bridge only carries southbound (I-82 Eastbound) traffic with a modern (and hideously ugly) bridge carrying northbound traffic right next to the bridge. It would have been nice to see some sensitivity to aesthetics of the historic bridge when the new bridge was built. A bridge that didn't block the view and compete with the appearance of the historic bridge would have been nice as was done in Michigan with the Blue Water Bridge.


Photo Galleries and Videos: Umatilla Bridge

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