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Budget Information

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


April 2017

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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 2019, 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, public outreach, design and environmental work began.

2019: Construction scheduled to begin in late summer or early fall.

Financial Information

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) $4,784
CWA $0
Total $4,784

Project signage will reflect the cost of construction engineering, project bid award and sales tax.

Total cost will be shared equally between ODOT and WSDOT.

How can I get more information?
Kimberly Dinwiddie
ODOT Community Affairs

Tamara Greenwell
WSDOT Communications

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