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Next Phase of Cleanup Begins in Spring

To minimize public exposure to the contaminated soil, King County Parks completed capping nearly all of the park’s backcountry trails and access roads with gravel in May 2020. In spring 2021, we will begin construction of a new parking area on SW 260th Street to cap the site of a former skeet range. The new parking area will have spaces for 20 vehicles and four equestrian trailers. We are also removing three acres of invasive vegetation on the south side of SW 260th St and prepping the area for planting native plants in the winter of 2021/2022.  The park will remain open during construction; however, individual trail or road sections may be temporarily closed throughout the project.
Typical Work hours:
7 a.m. to 7 p.m. Mon- Fri
9 a.m. to 6 p.m. Saturday

Site Management Plan

The Friends of Maury Island Park have offered to help serve a planning advisory role to assist King County’s efforts to finalize the Site Management Plan for the Maury Island Natural Area. That work has just begun and will continue throughout the fall. This management plan covers all future use of the natural area, not just the plans for cleanup. A draft was prepared in 2013 but could not be finalized until the details of the cleanup were decided.

About the Park:

Located on the southeast shore of Maury Island on lands formerly operated as a sand and gravel mine, the Maury Island Natural Area is now a 275-acre park. The park contains madrone forests and habitat that supports endangered species such as Chinook salmon, orca, and bull trout. The site’s nearly one mile of shoreline is the longest undeveloped stretch of Puget Sound shoreline in King County. When combined with the nearby 320-acre Maury Island Marine Park, the two parks represent the largest public holding of protected marine shoreline in all of Puget Sound. 

Park Activities: The park can be reached from Seattle by the Fauntleroy-Vashon ferry and from Tacoma by the Point Defiance-Tahlequah ferry. Once on Maury Island, head south on Dockton Road SW, east on SW 260th St.  

Parking: There is no formal access or parking on site, but non-motorized access is allowed via the gated maintenance road. 

Park History:

Citizen activists and environmental groups fought plans for mine expansion and advocated for public acquisition of the site, which was purchased in December 2010. Acquisition funding came from the King County Conservation Futures Tax, Washington State Department of Ecology ASARCO Settlement fund and an amendment to CalPortland’s existing royalty agreement for another mining site. In addition, community groups including Forterra, People For Puget Sound, Preserve Our Islands, Vashon-Maury Island Land Trust, and Washington Environmental Council began a fundraising campaign to help ensure the site would be protected and cared for in perpetuity.  

Due to previous mining activity and the site's location within the historic Tacoma Smelter plume, plans for land reclamation and soil remediation have been an integral part of site management planning. King County Parks has been working with a planning advisory group, which helped identify appropriate site uses and amenities, such as trail improvements, water access, restroom facilities, picnic areas and parking. We will finalize those recommendations as part of the planning process and in coordination with the Washington Department of Ecology.

Relevant Links: 

Maury Island Natural Area updates: Click to subscribe to an email newsletter for updates about the park.

January 2021 Bid Set of Construction Plans for King County Maury Island Open Space – Phase 1 Parking Area

May 2019 Bid Set of Construction Plans for King County Maury Island Open Space – Phase 1 Trails

March 2019 Maury Island Natural Area Clean-up - questions from community members

2013 Draft Maury Island Natural Area site management plan  

2013 Maury Island Natural Area draft site management plan maps (100 MB)


Agreed Order Cleanup Resources 

WA Dept of Ecology Cleanup Action Plan Public Notice  

RI/FS/DCAP SEPA DNS (March 2018) 

RI/FS/DCAP SEPA Checklist (February 2018) 

September 2017 Public Review Draft Cleanup Action Plan 

April 2017 Draft Final Feasibility Study 

WA Dept of Ecology Site Clean-up Project Webpage

2016 Clean-up FAQs

July 2016 WA Dept of Ecology Interim Action Clean-up Public Notice 

July 2016 SEPA Documents Interim Action Clean-Up  

June 2016 Interim Action Work Plan 

February 2016 Wetland Bioassay Report 

June 2014 Final Remediation Investigation (84 MB) 

July 2013 Dive Survey 

August 2013 Wetland Survey  

September 2016 WA DNR Derelict pier removal 

WA Dept of Ecology Tacoma Smelter Plum Clean-up 

About the environment on Vashon-Maury Island 

WRIA 9 Watershed and Salmon Conservation and Restoration