145th Street Corridor Project

Upcoming: 1st Avenue closure, June 10 and 11

June 10 and 11: 1st Avenue to close south of 145th Street

On Wednesday, June 10 and Thursday, June 11, crews will close 1st Avenue NE between N 145th Street and the Lakeside gym parking lot. The closure will be from 7 a.m. to 3 p.m. daily. Work will include jackhammering.

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Has it been a while since you've driven through a roundabout? Our roundabout webpage can refresh your memory whether you’re driving, riding, rolling or walking.

We are making improvements to NE 145th Street (State Route 523), including the Interstate 5 interchange. Phase 1 of the 145th Street Corridor Project and I-5 interchange Project will replace the signalized intersections on either side of I-5 with roundabouts and update lane configurations on the bridge over I-5. On the west side of the interchange, we will widen the roadway between I-5 and Corliss Avenue to improve traffic operations, mobility, and safety.

Design has resumed for Phases 2 and 3 of the 145th Street Corridor Project. We expect to begin construction in 2027 to extend these improvements to Linden Avenue. We are working with an arborist to begin tree reassessment for that portion of the corridor.

Once complete, these projects will improve safety and multimodal access along the 145th Street corridor and help connect to the Sound Transit Shoreline South/148th Light Rail Station. The interchange improvements will alleviate traffic congestion and enhance transportation mobility, reliability, and safety for all users.

Phase 1 of the 145th Street Corridor Project and 145th and I-5 Interchange Project

• Timeline: 2024-2026*
• Project status: Awarded to Johansen Construction Company
• Funding
  • 145th Street Corridor Project Phase 1: $28.7 million
  • 145th and I-5 Interchange Project: $35 million
• Contact:145thProject@shorelinewa.gov
• Project hotline: 206-899-5127

*Please note the construction schedule is subject to change.

What to expect

Throughout the project, travelers and residents will see shifted lanes, overnight lane and/or ramp closures, reduced speed limit in work zones, and short and long-term closures.

• If you are a frequent user of the 145th corridor, we advise you continue to plan for additional travel time and use alternate routes during this period. Unfortunately, there’s no way around it; construction on a major corridor like 145th is a significant disruption. We appreciate your patience and understanding as we work to enhance the safety and efficiency of our transportation infrastructure.
• A 24/7 hotline is available for people to call with questions or concerns: 206-899-5127.
  
• You can also email the project team at 145thProject@shorelinewa.gov.
  

  
  

  Detour routes
  The primary detour route when heading east and west is N 155th Street. There are no impacts to traffic travelling north and south on Meridian Avenue N, 1st Avenue, or 15th Avenue NE. However, northbound travelers on 1st Avenue are restricted from turning left to go west on Northeast 155th Street. See below for a detailed map of the detour routes.