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Trail Description

The Green River Trail winds more than 19 miles through industrial lands near the Duwamish Waterway in Tukwila to the broad Green River Valley. The trail provides excellent views and access to the Green River and surrounding river valley from Cecil Moses Park near Seattle’s south boundary to North Green River Park in south Kent near Auburn.

The trail links industrial lands to pastoral landscapes, parks, communities, and river views. Ideal for recreational journeys and nonmotorized commuting, the trail is highly popular with a variety of user groups. In the future the trail is slated to continue south through the City of Auburn and eventually to Flaming Geyser State Park at the Green River Gorge.

Green River Trail winding along

 Want updated construction information?

Visit the Project Information by Segment section to view the latest in design, outreach, technical reports and more. We'll keep all our Green River Trail neighbors and stakeholders up to date as construction progresses.

 New to the trail?

Visit the Trail History section to learn more about the trail's history, the collaboration that created the trail, and current management.

 Be a part of the trails community!

The Green River Trail, much like all of our Regional Trails System trails, is a work in progress requiring constant management and upkeep. We always welcome constructive suggestion about trail maintenance, or safety from our users. Be sure to let us know if you see something on the trail that you think we can improve.

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Closure Alerts and Info

Trail History

A trail from Seattle to Kent along the Green and Duwamish Rivers – The Green River Trail is one of the longest contiguous regional trails in the Puget Sound Region with 19 paved miles from the south edge of Seattle to the city of Kent. Following the shore of the Green River and the Duwamish River the trail passes through Cecil Moses Park and Fort Dent before converging with the Interurban Trail, which it crosses again in the southern region at Foster Park.

An excellent commuting corridor for many of the workers in the local business parks, the trail crosses several bridges, goes under Interstate 5, and traverses an older neighborhood surrounded with commercial development, allowing travelers a varied landscape to enjoy.

Along the banks are Osprey nests, as well as a number of covered benches for bird watching.

Why did King County develop the Green River Trail? – The Green River Trail is part of a larger vision of mobility and access to all residents of King County. Not only does our Regional Trails System provide a connection between locations, it also connects people to healthy living, recreational opportunities, mental health, stress reduction and much, much more.

A trail for the community – By 2018, design of the extension project for the paved trail through South Park is expected to be approved, and in the year following construction is anticipated.

Design and construction of the extension will continue to adhere to the standards of other regional trails, and will provide a safe, multi-use regional trail for bicyclists, pedestrians, joggers, skaters, strollers, wheelchairs, and users of all ages and abilities.

Project Information:

Location: This project would extend the existing Green River Trail north from Cecil Moses Park in Tukwila, along W Marginal Place S to the Seattle City Limits near South Park, thus completing an important regional trail link.

Construction update: This project is in the planning phase.

Recent Activity:

The project team is currently investigating the feasibility of constructing a paved regional trail separated from the roadway along W Marginal Place South. Geotechnical, environmental, and traffic studies are underway. This is a challenging segment due to space constraints caused by the proximity of the highway, the Duwamish River, and the Seattle City Light substation. King County hopes to identify some feasible design options and start public outreach for feedback in mid-2017. View one page project sheet.

Current Timeline:

 Milestone:  Date:
  • Public Outreach: 
  • Conceptual Alternatives Analysis
  • Alternative Selection
  • Start Intermediate Design
  • Start Permitting
  • Complete Design and Permitting
  • Construction
May-Dec 2017
May-Dec 2017
Dec 2017
Jan 2018
June 2018


Released design documents will be posted here for public review once available.

Technical Reports: Check back here to review all technical reports for this segment once available.

Public Outreach:

Neighborhood Meeting Summaries: