Construction alert: Mercer Island Station

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Construction alert

Stage Three of Construction Starting

Sound Transit is excited to announce the next phase of construction on the Mercer Island Transit Interchange project. Starting Tuesday, Jan. 17, road work will be shifting from the south side of North Mercer Way to the center of North Mercer Way. This construction zone shift will allow crews to complete the roundabout construction while keeping the road open for the public.

What this means for road traffic

  • There will be no changes to the flow of traffic
  • Westbound road traffic will continue to use the northern lane of North Mercer Way. Eastbound traffic will use the recently constructed southern lane of North Mercer Way.
  • The intersection at 77th Avenue SE and North Mercer Way will now function as a roundabout.

What this means for pedestrians

  • The southern sidewalk along North Mercer Way will be getting new bus stop improvements. In the coming weeks, pedestrian detours will be applied because of the construction. Detours will be announced.


Traffic shifting on North Mercer Way and the activation of the new roundabout at North Mercer Way and 77th Avenue SE.


Starting Tuesday, Jan. 17, 2023


North Mercer Island Way, between 77th Avenue SE and 80th Avenue SE


  • Plan ahead, leave early and allow extra time to reach your destination. 
  • Due to inclement weather or unforeseen issues, dates and times are subject to change.

More updates

Contact us

Community Engagement: or (206) 398-5300

Your safety is our priority

Learn how to stay safe around our construction sites.

Stay safe

24-hour construction hotline: 888-298-2395

More project info:
Get in touch: or (206) 398-5300