Project Info

Budget Information

I-5 - NB Interstate Bridge - South Tower Trunnion Replacements

Project news

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Why is WSDOT working with the Oregon State Department of Transportation (ODOT) to replace the northbound trunnion on the Interstate Bridge between Portland and Vancouver?
ODOT takes the lead on identifying and administering the preservation and maintenance needs on this bridge.

In summer 2020, crews will close the northbound span of the bridge to replace a cracked trunnion in the south tower, that raises and lowers the northbound span.

The closure will allow crews to safely bring in heavy equipment to remove and replace the trunnion, which is 20 inches in diameter and 4 feet long.

The End Result

  • Safety: Continued safe operation of this vital bridge, linking Oregon and Washington.
  • Maintain infrastructure: Continued use of the bridge by nearly 130,000 daily users.

Project Benefits
Replacing the northbound span's south tower trunnion allows for continued safe operation of this critical interstate drawbridge.

The northbound bridge was opened to traffic in 1917 and the southbound bridge was opened in 1958.

What is the project timeline?

  • 2016: Preliminary engineering and design
  • 2017: Design and environmental work continues
  • Summer/Fall 2020: Construction scheduled to begin


Financial Data for PIN 400518T
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $8,223
CWA $0
Total $8,223


How can I get more information?

Kimberly Dinwiddie
ODOT Community Affairs

Tamara Greenwell
WSDOT Communications