SR 525 - SB Alderwood Mall Pkwy - Intersection Improvements

Project News

  • The new traffic signal will be activated when the intersection is restriped for the new configuration. Crews will finish the project when they get the necessary safety equipment.
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Contractor crews are installing a traffic signal at the intersection where the southbound State Route 525 off-ramp meets Alderwood Mall Parkway in Lynnwood. There is also an on-ramp at this location to southbound SR 525, where drivers can access southbound Interstate 5 and I-405. Both ramps are being restriped, along with Alderwood Mall Parkway through the intersection. A crosswalk is be installed on the east side of the intersection and other improvements will create better sidewalk connections for people of all abilities.

Why is WSDOT improving this intersection?
An increasing number of vehicles use this intersection with currently up to 2,700 vehicles per hour during peak periods. From 2011 to 2015, there were 32 collisions at the intersection. Left alone, the crash rate is expected to remain the same or possibly increase as development grows in the area.

A traffic signal and improved striping are expected to increase line of sight, reduce collisions and improve traffic flow at the intersection. We considered installing a two-lane roundabout but decided against it because of possible backups from nearby traffic signals.

The End Result

This project will create a more efficient intersection with a reduced risk of collisions.

Needs & benefits

  • Safety: Improvements to this intersection will decrease the risk of severe collisions.
  • Pedestrian mobility: Creating better sidewalk connections for people of all abilities will increase safety and mobility in the area.


  • January 2017: Project was advertised for competitive bidding.
  • February 2017: Project was awarded to Totem Electric of Tacoma Inc.
  • July 2017: Construction began.
  • Spring 2018: Construction is scheduled to be complete.


Financial Data for PIN 152500S
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $1,295
CWA $0
Total $1,295


Tom Pearce

A small map of the intersection improvement project at the southbound SR 525 off- and on-ramps and Alderwood Mall Parkway in Lynnwood.

A small photo of the intersection of the southbound SR 525 off- and on-ramps and Alderwood Mall Parkway.

The intersection of the southbound SR 525 off- and on-ramps and Alderwood Mall Parkway.

View larger photos