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Fremont Bridge

Fremont Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: September 3, 2018

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Key Facts

Facility Carried / Feature Intersected
I-405 Over Willamette River
Portland: Multnomah County, Oregon: United States
Construction Date and Builder / Engineer
1973 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: Parsons Brinckerhoff of New York, New York

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
1,255 Feet (382.6 Meters)
Structure Length
7,340 Feet (2237.2 Meters)
Roadway Width
136.2 Feet (41.51 Meters)
3 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

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

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

 HAER Drawings, PDF - HAER Data Pages, PDF

With a 1973 construction date, this bridge falls outside the usual 1970 cutoff date that HistoricBridges.org established for its coverage. However, this bridge is included both because of its being part of Portland's unique collection of bridges, and also because of the bridge's engineering significance. The bridge was the longest tied arch span in the world when completed, and still reportedly held that record in 1999, although more recently, projects in China may have finally beat the length of the bridge. The bridge was also an engineering achievement due to its erection involving a lift of the 6,000 ton main span, which was also a world record at the time.

The overall length of the arch structure, including the main through arch spans, and the single approach span on each side of the through arch span, totals 2,154 feet. The total length given by HistoricBridges.org is an estimate from where the Cook Street/Gentenbein Avenue ramp starts to the end of the southern I-405 ramp Portland, which is the closest to a direct path across the bridge. The bridge also has numerous other winding ramps of greater approach length.


Photo Galleries and Videos: Fremont Bridge

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Bridge Photo-Documentation
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A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
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Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer


Maps and Links: Fremont Bridge

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