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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.
Kris Olsen
Communications
206-440-4704
olsenk@wsdot.wa.gov