SR 9 - Snohomish River Bridge Environmental Documentation - Completed

Due to regional economic development and the demand for affordable housing, the population of Snohomish County increased by 128 percent between 1980 and 2015.

This population growth has caused an influx of traffic on SR 9 throughout Snohomish County. The once rural road is now a critical corridor for both commercial vehicles and commuters. Current traffic volumes have exceeded the capacity of the two-lane roadway, making the once free-flowing, rural SR 9 a congested highway during peak travel times. 

Between 2000 and 2017 WSDOT invested $300 million to transform SR 9 from a rural road into a wider, safer highway.

Why did WSDOT study the options for widening SR 9 between Marsh Road and 2nd Street, including a new southbound bridge?
WSDOT explored options for widening SR 9 between Marsh Road and 2nd Street, including a new southbound bridge over the Snohomish River and connecting it to other widening projects on SR 9 due to the increasing demand on the highway. 

The environmental documentation study was required to help identify the type, size, and location of a new southbound bridge. The Washington State Legislature approved $142 million for a new bridge in the 2015 Connecting Washington transportation funding package. Construction on the new bridge is due to start in 2022. 

Project Benefits
Completion of the study in 2013 allowed WSDOT to move forward a project to build a new bridge.

What is the project timeline?

  • 2010: Study began
  • 2013: Study completed

Financial Information

Financial Data for PIN BL2000018
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $1,500
CWA $0
Total $1,500


How can I get more information?

WSDOT communications
15700 Dayton Avenue N.
Seattle, WA 98133