Project news

• Design work is underway.
• Sign up for email updates about state highway projects in Snohomish County.

Needs & benefits

The population of Snohomish County increased by over 400,000 residents between 1980 and 2018, adding traffic volumes on most state highways and interstates throughout the region. State Route 9 was once a rural highway with free-flow traffic. Now the two-lane road serves as the only north-south alternative to I-5 through Snohomish County for commercial vehicle and commuter traffic, with growing congestion during peak travel times. 

WSDOT created a plan to tackle SR 9 congestion through phased improvements that address the worst congestion first. This phase will widen the stretch between Marsh Road and 2nd Street near the city of Snohomish. WSDOT will construct southbound bridges immediately to the west of the existing bridges over the Snohomish River, and the existing bridges will become northbound lanes. The project will also reconstruct the southbound on-ramp to SR 9 at 2nd Street.

A widened SR 9 through the project area will reduce back-ups on SR 9 for Snohomish County commuters and residents, and improve access to the city of Snohomish.

Timeline

• 2019: Plan and design
• 2022: Begin construction
• 2025: Open new lanes and ramps

Funding

The Legislature allocated $142 million of the 2015 Connecting Washington transportation package to this project.