Mountains to Sound Greenway Trail

The Mountains to Sound Trail Greenway is a 100-mile long corridor along Interstate 90, stretching from the Seattle waterfront to Ellensburg in Central Washington. It features hiking and biking trails and a regional trail network used by pedestrians and bicyclists for recreation and transportation. The 3.6-mile trail project in Bellevue will close a gap in the trail between Factoria Boulevard and Lakemont Boulevard.


In 2013, the city began the final design on the Greenway Trail between Factoria Boulevard Southeast and 150th Avenue Southeast. The design follows recommendations made in the Mountains to Sound Greenway Trail Design Study. The alignment was chosen as part of a study of the entire Eastgate/I-90 corridor. Sections of the trail in Bellevue include:

  • Interstate 405 to 132nd Avenue SoutheastProvides a tunnel crossing under the I-90/I-405 ramp and a pedestrian/bicycle bridge over Factoria Boulevard Southeast to ensure bicycle and pedestrian safety. Portions of the trail will be relocated to improve capacity for the eastbound I-90 off-ramp to Factoria, helping to avoid long backups onto the highway.
  • 132nd to 150th Avenue SoutheastThis section will include a 12-foot-wide paved pedestrian and bicycle path on the north side of Southeast 36th Street. It will include walls, traffic signal modifications, new lighting and new pavement.
  • 156th Avenue Southeast to Southeast Lakemont BoulevardSection will include a new 12-foot-wide pedestrian and bicycle trail, along the south side of I-90.
Several ideas were considered as part of the Eastgate/I-90 Land Use and Transportation Project on how to address the “Eastgate Gap.” Community input and feedback indicated that bicyclists preferred the southern alignment because it is the most direct and continuous route. A citizen advisory committee endorsed the pathway depicted in the proposed Mountains to Sound Greenway alignment. The city, in partnership with the Mountains to Sound Greenway Trust, completed a design study of trail alignment along the south side of Interstate 90.


  • Summer 2019: Construction is tentatively scheduled to begin on I-405-132nd Ave. SE segment; completion will take approximately 18 months.


Construction funding for I-405 to 132nd Avenue Southeast segment is $17.7 million; funding for part of the 132nd to 150th Avenue Southeast segment is expected to be available in 2022; no construction funding is available at this time for the segment from 136th Place Southeast to Lakemont Boulevard.

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Chris MasekProject Manager




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