Courses & Maps

At a top level, here’s how the courses are laid out:

Course Map Overview

Half Marathon follows E., W. and N. Mercer Way around Mercer Island

Half Marathon Run/Walk Course Map

10K heads east across Mercer Island’s north end, then cuts back to the west side, then back to the start

10K Run Course Map

5K heads east side across Mercer Island’s north end, then back to the start

5K Run/Walk Course Map

Parking and Shuttles

View Parking Map

Please keep in mind:

  • Come early to avoid delays, as all events will start on time
  • Consider using King County Metro or Sound Transit to avoid the risk of slow-moving bridge traffic – even in the early morning, it can be challenging
  • Leave at least one hour before your start time if you are taking a shuttle from a remote lot on Mercer Island
  • All Eastbound traffic from Seattle should use Island Crest Way exit to avoid delays
  • West Mercer Way exit from I-90 will be closed from 7:45 am until noon
  • Westbound traffic from the Eastside should use either E. Mercer Way or Island Crest Way exits
  • Allow 45 minutes to park and get to the starting area (in front of the Community Center)
  • Make sure to note the shuttle pickup location nearest to your car on the parking map
  • Avoid the 77th Ave. SE exit after 8:00am
  • The Community Center parking lot will be closed


All events (March 22) and the Race Village (March 21-22) take place at the Mercer Island Community and Event Center. Check for signs posted at all Mercer Island I-90 exits when you arrive. The Pre-Race Expo, on Saturday, March 22, will be held in the Gym on the lower level of the Community Center.