SR 522 - Paradise Lake Road to Snohomish River Widening

Project news

  • $10 million in Connecting Washington funding becomes available to WSDOT in 2025 to begin initial design work and community outreach for this project and the Paradise Lake Road interchange
  • No funding for final project design, right-of-way acquisition and construction has been approved at this time.  
  • Highway users can receive email updates about state highways in Snohomish County, including the SR 522 corridor, by signing up for Snohomish County News.

Needs and benefits

Snohomish County’s population increased 137 percent between 1980 and 2017. As the county's population grows, SR 522 has become an increasingly important north-south route connecting communities between Woodinville and Monroe.

One section, between Paradise Lake Road in Maltby and the Snohomish River, remains one lane in each direction. We plan to widen the highway to create two lanes in each direction to improve traffic flow and increase trip reliability on the roadway. The wider highway will include some type of separation between oncoming lanes of traffic to reduce the risk of head-on collisions.

Doubling the capacity will also reduce the potential for rear-end collisions during stop-and-go conditions. Additional improvements will include new detention ponds near the highway to filter dirty highway storm water runoff before it’s released into area waterways, benefiting salmon and other wildlife. Several culverts that block fish passage will also be improved.


  • 2025: Design work resumes.


  • This project and the Paradise Lake Road interchange improvement project will receive $10 million in 2025 from the 2015 Connecting Washington transportation package.
  • Final design, right-of-way acquisition and construction are not currently funded. 


Kris Olsen

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