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Ross Island Bridge

Ross Island Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: September 3, 2018

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Key Facts

Facility Carried / Feature Intersected
US-26 Over Willamette River and Various Streets and Railroad
Portland: Multnomah County, Oregon: United States
Structure Type
Metal Cantilever 40 Panel Rivet-Connected Modified Warren (Subdivided) Deck Truss, Fixed and Approach Spans: Metal 24 Panel Rivet-Connected Modified Warren (Subdivided) Deck Truss, Fixed
Construction Date and Builder / Engineer
1926 By Builder/Contractor: Booth and Pomeroy of Portland, Oregon and American Bridge Company of New York, New York and Engineer/Design: Gustav Lindenthal

Technical Facts

Rehabilitation Date
Main Span Length
535 Feet (163.1 Meters)
Structure Length
3,653 Feet (1113.4 Meters)
Roadway Width
43 Feet (13.11 Meters)
3 Main Span(s) and 31 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

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

HAER Data Pages, PDF

HAER Documentation, Willamette River Bridges - Data Pages - Drawings -Timeline

This unique bridge has the appearance of an arch bridge. However in design it functions as a cantilever truss bridge, with no suspended span. This is an unusual design, but also a very attractive one. The bridge is one of several bridges in Portland designed by famous engineer Gustav Lindenthal. This one is one of the most significant and unique examples of his work in the city. The bridge retains good historic integrity with no major alterations to the main truss spans. The length of all truss spans, main and approach spans combined is 1,819 feet.


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