145th Street Corridor Project
145th Street reopens; all roadwork completed
On Wednesday, June 24, crews opened two lanes in each direction on 145th Street, including all lanes of the new roundabouts at I-5. Sunnyside, Corliss and 6th Avenues also reopened. This marks the completion of roadwork on the corridor. Please continue to drive carefully through the area as landscaping crews will be finishing work over the next several weeks.
Reminders for roundabouts: Slow down to 15-20 miles per hour as you approach. Follow the signs and painted road markings to choose the correct roundabout lane for your destination. Yield to any traffic already in the roundabout. Once inside the roundabout, continue to move without stopping. Do not change lanes once inside the roundabout. As you prepare to exit the roundabout, use your turn signal to indicate your intended direction. Visit shorelinewa.gov/roundabouts for more information about traveling safely through the roundabouts.
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 replaced the signalized intersections on either side of I-5 with roundabouts and updated lane configurations on the bridge over I-5. On the west side of the interchange, the roadway was widened 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.
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
*Roadwork was completed on June 24, 2026
Videos
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This video illustrates how all modes of travel will move through the roundabouts, including how drivers will travel through the roundabouts along with buses and trucks, and the routes pedestrians and bicyclists will use. The traffic shown in the video reflects the actual, projected traffic volumes at peak commuting hours, and how that volume of traffic will move through the proposed roundabouts.
Construction updates
Construction updates for June 25, 2026
145th Street reopens; all roadwork completed
On Wednesday, June 24, crews opened two lanes in each direction on 145th Street, including all lanes of the new roundabouts at I-5. Sunnyside, Corliss and 6th Avenues also reopened.
This marks the completion of roadwork on the corridor. Please continue to drive carefully through the area as landscaping crews will be finishing work over the next several weeks. 
The aerial photo faces south, showing the two new roundabouts at the 145th Street interchange.
Driving the roundabouts
Reminders for roundabouts: Slow down to 15-20 miles per hour as you approach. Follow the signs and painted road markings to choose the correct roundabout lane for your destination. Yield to any traffic already in the roundabout. Once inside the roundabout, continue to move without stopping. Do not change lanes once inside the roundabout. As you prepare to exit the roundabout, use your turn signal to indicate your intended direction. Visit shorelinewa.gov/roundabouts for more information about traveling safely through the roundabouts.
A bus navigates the new roundabout on the west side of the 145th Street overpass. As this photo demonstrates, large vehicles like buses and trucks will often take up both lanes in a roundabout due to their large turn radius. Never try to drive next to one in a roundabout. 
Both roundabouts feature crosswalks on all sides. Each crossing has a push-button pedestrian warning system. Sidewalk and bike lane improvements
ADA ramp and sidewalk improvements extend from the 6th Avenue NE to Corliss Avenue N. Bike lanes and widened sidewalks throughout the 145th Street corridor separate users from vehicle traffic and provide ample space for maneuvering.
The north side of the overpass features a new curb-separ]ated bike lane for two-way traffic. 
A wide sidewalk extends from the west roundabout to Corliss Avenue N. It gives plenty of space for people walking or rolling to and from the Shoreline South/148th Station. New median and crosswalks at Corliss Avenue
Two lanes of eastbound and westbound traffic are now open on 145th Street. A concrete median separates traffic at Corliss Avenue and features two north/south crosswalks and an east/west crosswalk. These crossings create better neighborhood connectivity for pedestrians and bicyclists.
A new median near Corliss Avenue separates oncoming traffic. 
The new median at Corliss Avenue also provides pedestrian refuge for new crosswalks.
These improvements are important to our growing city. We want to extend a big “thank you” to our community. We appreciate your patience during construction, and your attentiveness behind the wheel, ensuring our crewmembers make it home safely at the end of each shift.
All construction is complete. Landscaping crews may use daytime lane closures to complete work.
