I-5 - Marine View Dr to SR 528 - Peak Use Shoulder Lane & I/C Improvements

Project news

  • Design work is underway, scheduled for completion in spring 2020.

Needs & benefits

Between 1980 and 2017, the population of Snohomish County increased by 137 percent. It's expected to gain another 200,000 residents by 2035. This explosive growth increased the number of vehicles using I-5 between Everett and Marysville, with around 65,000 a day in the northbound direction alone. Drivers frequently experience heavy congestion and long commute times. In addition, traffic at the I-5/SR 528 interchange in Marysville often backs up, creating additional delays.

The 2015 Connecting Washington transportation package provided funding for:

  • A northbound peak-use shoulder lane between Marine View Drive in Everett and SR 528 in Marysville.
  • A northbound ramp from I-5 to SR 529.
  • A ramp from SR 529 to southbound I-5.

WSDOT will form a project stakeholder advisory group made up of representatives from area cities and agencies to make recommendations on how the peak-use shoulder lane should operate. In addition, WSDOT is looking into how the improved interchange can serve people who bike and walk on SR 529 between Marysville and Everett.

The benefits of a new peak-use shoulder lane and an improved interchange include:

  • Improved access: A completed SR 529 interchange, with new connections between Marysville and I-5.
  • Congestion relief: A new peak-use shoulder lane on northbound I-5 will reduce backups and improve traffic flow during the afternoon commute from Everett to Marysville.
  • Bikes and pedestrians: Bike and pedestrian access maintained on SR 529.
  • Restore fish habitat: To mitigate this project, WSDOT will restore about 11 acres of saltwater marsh habitat.


  • 2015: The Washington State Legislature approves funding in the Connecting Washington transportation package.
  • 2017 - 2020: Project design.
  • 2021: Construction begins.
  • 2022: Construction complete.


Financial Data for PIN 100549B
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $23
CWA $84,219
Total $84,242


Kris Olsen 
WSDOT Communications

A small map that shows the primary project area for peak use shoulder lanes between Everett and Marysville and an improved interchange at I-5 and SR 529 in Marysville.