145th Street Corridor Project

5th Avenue NE closed; upcoming closure of NE 145th Street

March 9-11: 1st Avenue NE to close
1st Avenue NE south of N 145th Street will close from March 9 to 11 as crews do final asphalt paving within the closed project area. NE 145th Street will remain open. A signed detour to Meridian Avenue will be available.

5th Avenue now closed through April 10

5th Avenue NE between NE 145th Street and the northbound I-5 on-ramp is now closed through April 10 as construction crews build out the new roundabout on the east side of the overpass. The northbound I-5 off-ramp to NE 145th Street will remain open through March 18. 6th Avenue NE and 8th Avenue NE will remain closed to through traffic from NE 145th Street.

Access to the Shoreline South/148th Station and the on-ramp to northbound I-5 will be maintained from NE 155th Street.

March 18-31: NE 145th Street overpass to close with 5th Avenue NE intersection

Crews will close the NE 145th Street and 5th Avenue NE intersection to all traffic from March 18 to 31. To set up the closure, crews will do overnight work in the intersection beginning at 9 p.m. Wednesday, March 18. The closure will allow crews to construct the new roundabout on the east side of the overpass. The following will be closed from the evening of March 18 to 31:

• The NE 145th Street overpass

• The northbound I-5 off-ramp to NE 145th Street

• 5th Avenue NE between NE 145th Street and the northbound I-5 on-ramp

• 6th and 8th Avenues NE at NE 145th Street

Access to the Shoreline South/148th Station and the on-ramp to northbound I-5 is maintained from NE 155th Street.

April 1-10: Eastbound 145th Street and northbound off-ramp reopen; westbound 145th Street and 5th Avenue NE stay closed

On April 1, eastbound 145th Street and the northbound I-5 off-ramp will reopen. The following areas will stay closed through April 10:

• 5th Avenue NE between NE 145th Street and the northbound I-5 on-ramp

• 6th and 8th Avenues NE

• Pedestrian access will be maintained; please follow all posted signage

Travelers are now using the new roundabout in a temporary single-lane configuration on the west side of the N 145th Street overpass. The east side of the overpass will remain signalized until April when another roundabout is opened in a temporary single lane configuration. Work will continue in the area, so please drive carefully and follow posted signs.

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.

• Lane reduction on N 145^th Street
  • Update on the lane reduction, Jan. 7, 2025: N 145th Street between 1st Avenue N and I-5 has reopened with a single lane in each direction. Access to and from I-5 is open.
    
  • 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, 5th 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.
    

    
    

    This graphic shows the flow of traffic on NE 145th Street with with one lane in each direction.