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Budget Information

SR 508 - S Fork Newaukum River Bridge Replacement


April 2017

This project will remove the aging South Fork Newaukum River Bridge that is located on State Route 508, five miles east of Onalaska, which carries approximately 1,400 vehicles a day. 

As part of the replacement project, the Washington State Department of Transportation is giving away the historic structure. The bridge is one of only 13 pony truss bridges over 50 years old remaining on public roadways or recreation trails in Washington.

The bridge, measuring 197-feet in length, consists of a six-panel, riveted-steel 90-foot main span Warren pony truss with verticals. The trusses are comprised of fabricated steel shapes, including channels, angles and plates. Contact us for more information, if you are interested in relocating and restoring this historic structure.

To keep existing traffic moving through the area, WSDOT maintenance crews built a temporary single-lane Bailey bridge in January 2015.

Traffic will continue to utilize the temporary Bailey bridge until the new bridge is completed.

Why is WSDOT replacing the South Fork Newaukum River Bridge? 

The existing bridge was built in 1930 and is now structurally deficient and functionally obsolete.

The End Result
The new bridge will provide users of SR 508 a safe and structurally sound bridge over the South Fork Newaukum River and meets current engineering and safety standards.

Project Benefits

What is the project timeline?

This project is currently in the design phase.
Spring 2017: Project goes to bid for construction.
Summer 2017: Estimated construction start date.
Spring 2018: Scheduled construction completion date.

Financial Information

Financial Data for PIN 450816R
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $8,350
CWA $0
Total $8,350

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

The estimated project cost is $8.2 million.

How can I get more information?
Joanna Lowrey
WSDOT Project Engineer
Phone: 360-442-1350 or toll free 1-800-545-1393 Email:


Tamara Greenwell
WSDOT Communications
Phone: 360-905-2056

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