SR 522 - Paradise Lake Rd to Snohomish River Br - Interchange & Widening

Project news

  • WSDOT has selected a preliminary preferred alternative for the SR 522/Paradise Lake Road interchange improvements.
  • WSDOT received $12.8 million in state funds in the 2019-2021 biennium. $10 million in Connecting Washington funding will now be available in 2021-2023. These funds will be used for design and right-of-way acquisition.
  • There is no construction funding to complete the interchange and widening improvement projects on SR 522. The total cost of all improvements is estimated at $180 million.

Needs & benefits

Snohomish County’s population increased 143 percent between 1980 and 2019. As the county's population grows, SR 522 is 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. This includes building a new eastbound bridge at the Fales Road/Echo Lake Road interchange and converting the existing bridge to westbound traffic only.

Drivers also regularly experience heavy congestion at the SR 522/Paradise Lake Road intersection. The congestion frequently spills over onto side streets as drivers try to find ways around the bottlenecks on the highway.

An improved interchange, capable of handling more cars more efficiently, will increase traffic flow, decrease congestion, and improve travel times. It will also decrease the risk of rear-end collisions during stop-and-go conditions, greatly improving driver safety.

Those interested in obtaining the preliminary preferred alternative study may request it through a public disclosure request.


  • 2017 - 2019: Preliminary traffic analysis, concept, design and community engagement.
  • Winter 2019: Preliminary preferred alternative selected
  • 2019 - 2023: Continuing design, analysis, community engagement and right-of-way acquisition.


Financial Data for PIN 152232K
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $12,873
CWA $10,000
Total $22,873


Kris Olsen
WSDOT communications

Project map for SR 522 widening and interchange work.