The Mountains to Sound 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 Mountains to Sound Greenway 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.
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.
Sections of the trail in Bellevue include:
- Interstate 405 to 132nd Avenue Southeast: Provides a tunnel crossing under the I-405 to eastbound I-90 ramps and a 12-foot 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. (See rendering.)
- Status: Open March 30, 2021.
- 132nd Avenue SE to 142nd Place Southeast: This section will include a 12-foot-wide paved pedestrian and bicycle path on the north side of Southeast 36th Street, walls, traffic signal modifications, new lighting and new pavement.
- Status: Construction expected to begin in February 2021 and be completed by the end of 2021. Details in construction alert (Jan. 2021)
- 142nd Place Southeast to 150th Ave SE: This section will include a 12-foot-wide paved pedestrian and bicycle path on the north side of Southeast 36th Street. It will include walls, a new mid-block crosswalk at 146 Ave SE, new lighting and new pavement.
- Status: Project is at the 90% design level. Funding has not yet been identified to complete the design or construct the project.
- 156th Avenue Southeast to Southeast Lakemont Boulevard: Section will include a new 12-foot-wide pedestrian and bicycle trail, along the south side of I-90, north of Southeast 36th Street.
- Status: Funding is not yet available.
- 2021: Construction on the section from 132nd Avenue Southeast to 142nd Place Southeast is expected to begin, with completion by the end of 2021.
- 2019-2021: Construction on the section from I-405 to 132nd Avenue Southeast began in September 2019 and is expected to be complete by early 2021.
Construction funding for I-405 to 132nd Avenue Southeast segment is $17.7 million. Construction funding for the trail section between 132nd Avenue Southeast and 142nd Place Southeast is $9.4 million. Design and construction funding for the segments from 142nd Place Southeast and Lakemont Boulevard is not yet available.
Construction Alert for I-405 to 132nd Ave SE (Aug. 2019)
Final Trail Design Study (2012)
- Final Trail Design Study Appendices (2012)