Mercer Island Transit Interchange

In fall of 2017, the City of Mercer Island and Sound Transit approved a Settlement Agreement intended to offset the impacts of light rail construction and operation, and also to partially compensate for permanent impacts to local traffic patterns.

King County Metro was not a party to the agreement, but it was known at the time that Metro would need to be involved in implementing the "77th Avenue SE Configuration" that will allow buses to exchange passengers with light rail trains in the future. As a result, Sound Transit commissioned the Mercer Island Transit Interchange Operational and Configuration Study (Full Study; Exec Summary) to evaluate how Metro buses will integrate with the light rail station.

The future transit interchange achieves the key tenets of the Settlement Agreement:

  • A roundabout at N Mercer Way & 77th Ave, and no substantial bus operations/layovers along 80th Ave
  • Future bus volumes less than existing bus volumes
  • No routing of regional buses through MI Town Center
  • Limited occurrences of long bus layovers
  • No bus idling

Learn more by reading the FAQs and studying the document library; please submit questions or post comments as you wish.

In fall of 2017, the City of Mercer Island and Sound Transit approved a Settlement Agreement intended to offset the impacts of light rail construction and operation, and also to partially compensate for permanent impacts to local traffic patterns.

King County Metro was not a party to the agreement, but it was known at the time that Metro would need to be involved in implementing the "77th Avenue SE Configuration" that will allow buses to exchange passengers with light rail trains in the future. As a result, Sound Transit commissioned the Mercer Island Transit Interchange Operational and Configuration Study (Full Study; Exec Summary) to evaluate how Metro buses will integrate with the light rail station.

The future transit interchange achieves the key tenets of the Settlement Agreement:

  • A roundabout at N Mercer Way & 77th Ave, and no substantial bus operations/layovers along 80th Ave
  • Future bus volumes less than existing bus volumes
  • No routing of regional buses through MI Town Center
  • Limited occurrences of long bus layovers
  • No bus idling

Learn more by reading the FAQs and studying the document library; please submit questions or post comments as you wish.

  • We're Working on Answering All Your Questions

    28 days ago
    Studysession 19march2019 sm

    At the March 19 Council Meeting, representatives from Metro and Sound Transit provided a lot of insight into bus operations and roundabout construction. We received a number of questions during that night's 90-minute session, as well as others that continue to come in via this site. We are gathering data from the agencies and posting the responses as soon as possible...

    You can watch the meeting footage here on the Council YouTube Channel -- Thank you!

    At the March 19 Council Meeting, representatives from Metro and Sound Transit provided a lot of insight into bus operations and roundabout construction. We received a number of questions during that night's 90-minute session, as well as others that continue to come in via this site. We are gathering data from the agencies and posting the responses as soon as possible...

    You can watch the meeting footage here on the Council YouTube Channel -- Thank you!

  • Submit Your Questions Today About Interchange Operations

    about 1 month ago

    In advance of a March 19 Council Study Session (meeting materials posted here), the City is gathering questions from the public about the future operations of the transit interchange that will allow regional buses to exchange passengers with East Link Light Rail trains (starting in 2023). Please use the Ask a Question Tab to submit yours, or check the FAQ page.

    In advance of a March 19 Council Study Session (meeting materials posted here), the City is gathering questions from the public about the future operations of the transit interchange that will allow regional buses to exchange passengers with East Link Light Rail trains (starting in 2023). Please use the Ask a Question Tab to submit yours, or check the FAQ page.