1. Home
  2. Construction & planning
  3. Search projects
  4. I-405/Brickyard to SR 527 Improvement Project
  • Project

I-405/Brickyard to SR 527 Improvement Project

SR 522 will close in both directions at I-405 beginning Sunday, Nov. 16 to 4 a.m. Monday, Nov. 17 to test new signals. During the full directional closures, a signed detour route for eastbound SR 522 traffic and a signed detour route for westbound SR 522 traffic will be in place. 

Traffic change coming: New traffic signals on SR 522 and northbound I-405 ramp to SR 522. Crews need good weather to complete the remaining ramp build and striping to make the traffic switch as early as Nov. 24. Keep an eye out for new signs, lane lines, and traffic signals — things will look a little different! Read more on the WSDOT blog.

Project overview

The I-405/Brickyard to SR 527 Improvement Project enhances four and a half miles of the corridor, primarily in Bothell, from just south of the State Route 522 interchange and ending at the SR 527 interchange. WSDOT, Sound Transit and design-build contractor Skanska USA Inc., will deliver improvements that benefit all users, while addressing aging infrastructure, opening upstream fish habitat, and connecting communities, freight and Regional Growth Centers throughout the corridor.

Since implemented in 2015, express toll lanes (ETL) have helped improve reliability of trips on the north end of the I-405 corridor, however the single-lane section still experiences heavy congestion, especially for people traveling south during the morning commute. The project will extend the dual-express toll lane system on the north end of I-405 and improve access to the voter-approved Stride bus rapid transit service to address congestion and help keep all vehicles moving efficiently.

This project includes three new Stride stations and will build direct access ramps to the ETL system at SR 522, along with a partial direct access interchange at SR 527 to and from the south connecting to the Canyon Park Park & Ride. These enhancements will allow Stride vehicles to travel in the new ETLs between Lynnwood and Bellevue while stopping briefly to pick-up and drop-off passengers without having to leave the highway system. Having dedicated ETL access in the center of the freeway will make travel more efficient supporting the new Stride service with buses arriving every 10 minutes for most of the day.

Additionally, the project will address aging infrastructure, restore stream connections, add noise walls and add new stormwater facilities.

Timeline
The project is expected to complete construction in 2028 in alignment with Sound Transit Bus Rapid Transit.
Project status
Construction
Funding
$834 Million

What to expect

Reminder to slow down to 35 MPH

WSDOT has started a pilot Work Zone Speed Limit Camera program. This program will be coming to the project as early as April 28, with a camera placed first on eastbound SR 522, before the I-405 interchange. The location of the speed camera may be adjusted throughout the project. Please slow down on SR 522 near the I-405 interchange for the safety of constructions crews and the traveling public.

Sammamish River Trail Reroute and brief closures

In order to complete work safely next to the Sammamish River Trail and move equipment, crews will need to continue to close it temporarily. Trail users can expect brief closures for the duration of the project which is scheduled to be complete in Spring 2028. 

There will be a short reroute around the active work zone underneath the I-405/SR 522 interchange. Brief weekday, daytime closures of the trail will occur no longer than 15 minutes per closure and no more than 45 minutes total per day. 

  • Closures will occur intermittently between the hours of 9 a.m. and 3 p.m., and overnight between 7 p.m. and 5 a.m.
  • Signage along the trail ahead of the reroute will direct you where to go. Flaggers will be present during closures to direct traffic. 

Overnight closures will not take place during the weekends, except on select weekends with prior notice. Please take caution when travelling along the trail outside of daytime hours. Construction activities are ongoing in the area to build the foundation for the new northbound I-405 ramp bridge to eastbound SR 522. Crews will conduct this work during daytime hours.  Trail users can expect nighttime closures in mid-June when crews set girders for the new I-405 ramp bridge.   

Upcoming closures

Highway lane closures:

  • The right general-purpose lane of southbound I-405 between Northeast 195th Street (milepost 24.45) and SR 522 (milepost 23.7) will be closed nightly from 8 p.m. Wednesday, Nov. 12 to 6 a.m. Friday, Nov. 14.
  • The collector distributor lane of eastbound SR 522 between 131st Avenue Northeast (milepost 11.6) and Campus Way Northeast (milepost 10.5) will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The right general-purpose lane of eastbound SR 522 between 131st Avenue Northeast (milepost 11.4) and Campus Way Northeast (milepost 10.5) will be closed nightly from 11 p.m. Wednesday, Nov. 12 to 4 a.m. Friday, Nov. 14.
  • The left general-purpose lane of eastbound and westbound SR 522 between 131st Avenue Northeast (milepost 11.65) and Hall Road (milepost 9.5) will be closed nightly from 8 p.m. Wednesday, Nov. 12 to 4:30 a.m. Friday, Nov. 14.
  • The right general-purpose lane of northbound SR 527 between Bothell Everett Highway (milepost 2.6) and I-405 (milepost 2.9) will be closed nightly from 11 p.m. Wednesday, Nov. 12 to 4 a.m. Friday, Nov. 14.
  • The right general-purpose lane of southbound SR 527 between 214th Street Southeast (milepost 3.2) and I-405 (milepost 2.95) will be closed nightly from 9 p.m. Wednesday, Nov. 12 to 4 a.m. Friday, Nov. 14.
  • The right general-purpose lane of northbound I-405 between Northeast 116th Street (milepost 19.65) and Northeast 160th Street (milepost 22.55) will be closed nightly from 8 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The two right general-purpose lanes of northbound I-405 between Northeast 132nd Street (milepost 21.43) and Northeast 195th Street (milepost 24.8) will be closed nightly from 10 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The right general-purpose lane of westbound SR 522 between Campus Way Northeast (milepost 10.85) and 131st Avenue Northeast (milepost 12.1) will be closed nightly from 11 p.m. Wednesday, Nov. 12 to 4:30 a.m. Sunday, Nov. 16.
  • The collector distributor lane of eastbound SR 522 between 131st Avenue Northeast (milepost 11.6) and Campus Way Northeast (milepost 10.5) will be closed starting at 10 p.m. Friday, Nov. 14 to 5 a.m. Monday, Nov. 17.
  • The right general-purpose lane of eastbound SR 522 between 131st Avenue Northeast (milepost 11.4) and Campus Way Northeast (milepost 10.5) will be closed starting at 11 p.m. Friday, Nov. 14 to 4 a.m. Monday, Nov. 17.
  • All lanes of eastbound and westbound SR 522 will be closed overnight from 11 p.m. Sunday, Nov. 16 to 4 a.m. Monday, Nov. 17.

Highway ramp closures:

  • The southbound I-405 on-ramp from Northeast 160th Street will be closed nightly from 10 p.m. Wednesday, Nov. 12 to 4 a.m. Friday, Nov. 14.
  • The southbound I-405 on-ramp from eastbound SR 522 will be closed nightly from 10 p.m. Wednesday, Nov. 12 to 4 a.m. Friday, Nov. 14.
  • The northbound I-405 off-ramp to SR 522 will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The Northeast 160th on-ramp to northbound I-405 will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The southbound I-405 off-ramp to eastbound SR 522 will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The northbound I-405 on-ramp from eastbound SR 522 will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The northbound I-405 off-ramp to SR 527 will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 4:30 a.m. Friday, Nov. 14.
  • The northbound I-405 on-ramp from southbound SR 527 will be closed nightly from 11 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The northbound I-405 off-ramp to Northeast 160th Street will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The northbound I-405 off-ramps to eastbound and westbound SR 522 will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The northbound I-405 on-ramp from Northeast 132nd Street will be closed nightly from 11:59 p.m. Wednesday, Nov. 12 to 5 a.m. Friday, Nov. 14.
  • The northbound I-405 on-ramp from northbound SR 527 will be closed nightly from 11 p.m. Wednesday, Nov. 12 to 4 a.m. Friday, Nov. 14.
  • The northbound I-405 to SR 522 off-ramp will be closed starting at 10 p.m. Friday, Nov. 14 to 5 a.m. Monday, Nov. 17.
  • The SR 522 collector distributor ramp from Northeast 160th Street will be closed starting at 10 p.m. Friday, Nov. 14 to 5 a.m. Monday, Nov. 17.
  • The southbound I-405 off-ramp to eastbound SR 522 will be closed starting at 10 p.m. Friday, Nov. 14 to 5 a.m. Monday, Nov. 17.
  • The northbound I-405 on-ramp from eastbound SR 522 will be closed starting at 10 p.m. Friday, Nov. 14 to 5 a.m. Monday, Nov. 17.
  • The southbound I-405 off-ramp to eastbound SR 522 will be closed overnight from 11 p.m. Sunday, Nov. 16 to 4 a.m. Monday, Nov. 17.
  • The northbound I-405 on-ramp from eastbound SR 522 will be closed overnight from 11 p.m. Sunday, Nov. 16 to 4 a.m. Monday, Nov. 17.

Local street closures:

  • Alternating eastbound and westbound, the general-purpose lane of Woodinville Drive from Juanita/Woodinville Way to East Riverside Drive will be closed daily from Monday, Nov. 10 to Friday, Nov. 14 from 10 a.m. to 2 p.m. Flaggers will alternate traffic.
  • The eastbound lane of 17th Avenue Southeast from 220th Street Southeast to Canyon Park Park and Ride will be closed nightly from 10 p.m. Wednesday, Nov. 12 to 4 a.m. Friday, Nov. 14. Flaggers will be on site.
  • The westbound lane of 17th Avenue Southeast from I-405 to 220th Street Southeast will be closed nightly from 10 p.m. Wednesday, Nov. 12 to 1 a.m. Friday, Nov. 14. Flaggers will be on site.

Trail closures:

  • From Monday, Nov. 10 to Friday, Nov. 14, a short section of the Sammamish River Trail under the SR 522 overpass bridges will have brief daytime closures no longer than 15 minutes. In the event of a short-term closure, flaggers will be on site halting pedestrian and bicycle traffic to maintain safety

Map of I-405 showing the area that will be improved, from SR 522 to SR 527, highlighted in orange.

Overview

The 50-mile I-405/SR 167 corridor serves a rapidly growing region from Lynnwood to Puyallup. As the area exceeds projected population growth, attracts large businesses, and creates more jobs, the demand for transportation systems continues to increase. To meet this growing demand, we continue a 20-year history of working with cities, counties, the Legislature, and transit agencies along the corridor to carry out the long-term vision for transportation along this important north-south corridor. 

A major part of the I-405/SR 167 multimodal vision includes building a corridor-wide express toll lane (ETL) system from Puyallup to Lynnwood and supporting a high-capacity transit system called Bus Rapid Transit (BRT). Improvements to our I-405/SR 167 corridor and implementing Sound Transit’s I-405 Stride system are essential to the region’s transportation network, readiness for growth, and quality of life.

I-405 Express Toll Lanes (ETLs)

In 2015, we launched ETLs between Bellevue and Lynnwood with two ETLs in each direction between Northeast Sixth Street in Bellevue and just south of the SR 522 interchange in Bothell and a single ETL between SR 522 and I-5. While express toll lanes have helped reduce traffic and improve reliability on the north end of the I-405 corridor, the single-lane section still experiences heavy congestion, especially for people traveling south during the morning commute.

The Brickyard to SR 527 Improvement Project aims to relieve some of that pressure by adding an additional express toll lane in each direction in this area. Consistent with the long-term vision for the corridor, we are moving forward with these additional improvements to mobility and reliability on I-405 in Bothell and south Snohomish County.

Sound Transit Stride bus rapid transit

We have worked closely with the City of Bothell and Sound Transit to design the new inline Stride station at the Brickyard Park and Ride in Bothell. Stations and direct access ramps to the ETLs also will be added to the SR 522 and SR 527 interchanges. These Stride stations will integrate with the voter-approved Stride service along I-405. This work will enable Stride vehicles to travel exclusively in the new ETLs between Lynnwood and Bellevue, increasing service reliability, and decreasing Stride travel times. This new system will offer better transportation options for everyone who uses I-405.

Economic contributions

The project will contribute to economic growth in the region by investing in key Bothell destinations and employment centers, including the University of Washington (UW) Bothell/Cascadia College campus, two business parks, a commercial center with a variety of businesses, and residential development. It also supports the City of Bothell's efforts to update the Canyon Park subarea plan, which notes the importance of WSDOT and Sound Transit transportation investments in this area.