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Columbia Slough Bridge


Columbia Slough Bridge

Photo taken by Michael Goff in April 2011


BH Photo #197745

Street Views 


The Columbia Slough Bridge on OR 99E was constructed in 1916 as part of the Interstate Bridge project. The bridge features built-up steel plate girder main spans and the same decorative steel railing found on the 1917 Interstate Bridge over the Columbia River. The bridge was likely designed by consulting firm of Waddell and Harrington just like the Interstate Bridge located just a short distance to the north.

The 304-foot original portion of the bridge features four steel plate girder spans with two main spans of 77.3-feet and two side spans of 76.2-feet. In 1951 the original 44-foot wide structure was widened to 58-feet by the Oregon State Highway Department to accommodate another traffic lane. The new portion of the bridge has a different span layout featuring two 140-foot plate girder mains spans and reinforced concrete approach spans at each end of the structure. The total length of the widened portion of the bridge is 362.5-feet.


Deck plate girder bridge over Columbia Slough on OR 99E (MLK Jr. Blvd)
Portland, Multnomah County, Oregon
Open to traffic
Built 1916, Widened 1951
- Glenn S. Paxson of Salem, Oregon (Bridge Engineer - 1951 Widening)
- Waddell & Harrington of Kansas City, Missouri (Original Design Firm)
Steel plate girder with reinforced concrete approach spans
Length of largest span: 76.1 ft.
Total length: 304.1 ft.
Deck width: 58.1 ft.
Approximate latitude, longitude
+45.58667, -122.66333   (decimal degrees)
45°35'12" N, 122°39'48" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/526262/5048180 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2014)
Inventory numbers
OR 01377C (Oregon Dept. of Transportation structure number)
BH 48672 (Bridgehunter.com ID)
Inspection report (as of January 2017)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Fair (5 out of 9)
Sufficiency rating: 47.1 (out of 100)
View more at BridgeReports.com

Update Log 

  • April 22, 2011: Added by Michael Goff


  • Mike Goff - michael [dot] goff [at] hotmail [dot] com