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AtWorkLogo2017_UltraThrough our Capital Improvement Program (CIP), we are building new and enhancing existing recreation amenities while caring for all of the assets in our 28,000-acre system of parks and trails.

Unless otherwise specified, these projects are funded in part or in whole by the 2020 - 2025 King County Parks, Recreation, Trails, and Open Space Levy. Thanks for your support!

The list below reflects key current CIP projects, but we've got more than 300 projects in the hopper at any given time.

If you don't see a particular project listed, please contact with questions.

Ballfield Turf Replacement

King County Parks is continuously inspecting the condition of our existing athletic field synthetic turf throughout the King County Parks system and replacing the synthetic turf at the end of its useful life cycle.

Upcoming projects:

  • Preston Park Soccer Practice Fields 1 & 2 – Preston soccer practice fields 1 & 2 and the north parking lot will be closed for construction beginning April 25, 2022.  Construction is weather dependent and anticipated to last up to twelve weeks. The fields and north parking lot will be reopened as soon as all work is complete.

Project Manager: Annie Mathews

Future projects:

  • Petrovitsky Soccer Fields 1 & 2 – 2023~2024
  • Ravensdale Park Baseball Infield and Soccer Field – 2023~2024
  • Preston Park Soccer Field – 2024~2025
  • Redmond Ridge Multi-Use Field and Baseball Fields – 2024~2025

Project Manager: Jason Anglin and Annie Mathews

Bridge and Trestle Program

There are 94 bridges and trestles in King County's Regional Trails System, including 41 spans that are now more than 90 years old. King County Parks inspects, monitors, load rates, repairs, and replaces these structures on an on-going basis.

Current and recently completed projects include:

  • Replacement of the trail bridge near Remlinger Farm in Carnation (Completed Spring 2021)
  • Design of a replacement structure for the #2 bridge on the Preston-Snoqualmie Trail (near Lake Alice Rd.)
  • Various Tolt-MacDonald Park Suspension Bridge Repairs
  • Rehabilitation of the 314’ Boxley Bridge along the Snoqualmie Valley Trail
  • Annual Bridge Inspections
  • Response to emergent bridge projects as needed

Burke-Gilman Trail - Lake Forest Park Improvements

This project is now complete. Read more about the completed Burke-Gilman Trail Lake Forest Park improvements.

Central Maintenance Facility (Renton Shop)

  • Design and permitting:  2018 – 2021
  • Construction: 2022-2024

Project Manager: Brenda Bradford

Cougar Mountain Regional Wildland Park – Big Tree Ridge (Cougar Precipice) Trailhead

Funded in part by the Washington Wildlife and Recreation Program and the 2014-2019 King County Parks, Trails, and Open Space Replacement Levy, this project constructs a new trailhead serving the northeast part of Cougar Mountain Regional Wildlife Park, off of Newport Way NW and will be the first new parking lot at the park since the 1990s. Project elements include construction of a 20-vehicle parking lot and installation of trailhead amenities, such as a restroom, bike racks, picnic tables, and an informational kiosk. This trailhead will access the existing Big Tree Ridge Trail, which connects to the park’s 36 miles of trails.


  • 2017 - Preliminary Design
  • 2018-20 – Permitting and Final Design
  • Fall 2022 – Construction
Questions? Call (206) 477-4527 or email

Cougar/Squak Corridor Trailhead

Funded by the 2014-2019 King County Parks, Trails, and Open Space Replacement Levy, this project will renovate and expand the existing trailhead and parking lot at Cougar/Squak Corridor, which serves the popular Margaret's Way Trail.

This project is currently on hold pending re-evaluation of public use of the park and related infrastructure needs.

Project Manager: Linda Frkuska

Derby Creek Flood Reduction and Enhancement Project

This project will alleviate seasonal flooding of the Northshore Athletic Fields and remove two fish barriers by reconstructing approximately 800 feet of sediment-laden stream channel and replacing failing, undersized, fish barrier culverts, one under the Sammamish River Trail and another in the athletic fields. Similar stream channel reconstruction has already occurred in Derby Creek upstream. This project will complete the downstream portion of Derby Creek, connecting it all the way to the Sammamish River. 


The following technical documents are available for this project:


The project is currently under construction and is funded in part by grants from the King County Flood Control District and Cedar Sammamish Lake Washington Watershed. Construction is estimated to be complete by the end of 2021.

Project Manager: Colin Worsley

Dockton Park - Marina Renovation

The marina at Dockton Park will remain until work in complete. Please respect the closure so we can complete our work as soon as possible.

Funded in part by grants from the state Boating Facilities Program, this project will renovate the moorage facility including:

  • Removing and replacing creosote-treated piles
  • Installing a new pump-out station
  • Repairing cross-bracing
  • Replacing the access dock, center moorage, and walkway
  • Installing a new fire suppression system
  • Installing new interior floats

King County Parks closed the marina to overnight moorage in April 2019 after the facility experienced significant and rapid deterioration from an unusually harsh winter.

Progress to date includes:

  • Removed deteriorated interior and breakwater finger piers
  • Installed skid resistant coating on the fixed pier
  • Replaced guides and wheels on gang planks
  • Removed polluting creosote pilings and replaced them with galvanized, epoxy coated steel piles (interior only)
  • Wrapped polluting creosote pilings on the fixed pier

In spring 2022, King County Parks will complete the following project elements:

  • Install new floats for the inner moorage and access dock
  • Replace the interior and main walkway floats with ones made of an aluminum frame and fiberglass decking
  • Replace timber whalers on the breakwater, as needed

We anticipate re-opening the facility by Memorial Day 2022. The breakwater will remained closed until it is replaced, anticipated for 2023.

Stay up to date on all things at Dockton Park by subscribing to the Dockton Park e-newsletter.

Project Manager: Deena Hall

East Lake Sammamish Trail


Foothills Trail

Green River Trail - North Extension

Green to Cedar Rivers Trail

Infrastructure Rehab Program

With 200 parks, 22 restrooms, 26 picnic shelters, and 3 historic buildings, it takes a lot of on-going maintenance to keep our facilities and infrastructure operating safely and efficiently so they can remain open for the public to enjoy.

Assessments, evaluations, rehabilitation or replacement of existing park buildings, facilities, infrastructure, utilities and other systems are ongoing under this program. Projects completed under this program often involve repairing, maintaining, or replacing roofs, restrooms, parking lots, sidewalks/walkways, gates, signs, fencing, drainage structures, and building systems (ex: HVAC).  Some projects examples recently completed in 2019/2020 include:

  • Five Mile Lake Restroom Rehab
  • Five Mile Lake Staff Maintenance Shop Mold Remediation
  • Cottage Lake Pool Cover Improvements
  • King County Aquatic Center Hot Water Pipe Replacement
  • King County Aquatic Center Fire System Replacement
  • Lake Francis Baseball Backstop Replacement
  • Marymoor Park Office ADA Access Improvements (new porch with ramp)
  • Marymoor Clise Mansion Fire System Replacement
  • Preston Snoqualmie Valley Trail Emergency Landslide Repairs
  • Dockton Park Septic System Repair

Project Managers: Lindsey Miller and Tri Ong

Lake to Sound Trail

Little Lake Forest- Trailhead and Park Amenities

King County Parks and Recreation plans to enhance this newly acquired open space with a trailhead and amenities to support outdoor recreation and community gatherings. The trailhead, funded by the King County Parks, Trails, and Open Space Replacement Levy, will be constructed first and will provide parking to access the 155 acres of Little Lake Forest. Following trailhead construction, park amenities, funded by the Recreation Conservation Office’s Washington Wildlife and Recreation Program, will be constructed and may include a playground, picnic shelter, seating areas, restrooms, interpretive signs and native plant landscaping.



  • Fall 2022 – Preliminary Design
  • Winter 2022 - SEPA Review 
  • Winter 2022 – Permit Application Submission
  • Spring 2023 - Final Design
  • Fall 2023 – Permit Approval
  • Winter 2023 – Construction

Park Amenities

  • Fall 2023 - Preliminary Design
  • Winter 2023 - SEPA Review
  • Spring 2024 – Permitting and Final Design
  • Summer 2024 - Construction

Questions? Call (206) 477-4527 or email

Marymoor Park

As our most popular park, Marymoor Park sees more than three million visitors every year. With so many diverse recreation opportunities and historic facilities located there, King County Parks has on-going efforts to repair and improvement the park’s amenities and infrastructure.

Completed projects include:

  • Replacement of heat pump at Clise Mansion – 2018
  • Park office roof repairs – 2018 
  • Concert seating area flooring – 2017
  • Parking lot B entrance widening – 2017
  • Replacement of synthetic turf on 4 soccer fields – 2017
  • Pathway resurfacing and repairs - 2017
  • Habitat restoration mitigation and monitoring for the Connector Trail (on-going)
  • Velodrome apron & surface repair – completed June 2019. – Project Manager: Sam Dykes
  • Replacement of synthetic turf on ballfields 5 and 6 (baseball 1 and 2) –completed August 2019. – Project Manager: Annie Mathews

Current and upcoming projects include:

  • Park office ADA access improvements – Construction summer 2019. Project Manager: Jennifer Kim
  • Water system updates and water use assessment planning - To be completed in 2019. Project Manager: Allison Speicher
  • Feasibility and planning for renovation and addition to the historical cottage, which serves as park office - Fall 2019. Project Manager: Jennifer Kim
  • Water supply improvements and extension - To be completed by 2023. Project Manager: Allison Speicher
  • Connector Trail extension from Redmond light rail station (in partnership with Sound Transit) – Trail opening to coincide with new Light Rail station opening – Scheduled for 2024. Project Manager: Allison Speicher
  • Marymoor Stormwater Treatment Facility – In partnership with Sound Transit, and in compliance with King County’s Stormwater Manual, King County will be constructing a new stormwater treatment facility within Marymoor to treat approximately 2.1 acres of pollution generating impervious surfaces, such as parking lots or roadways. The treatment facility may take the form of a bioswales, water quality ponds, or other King County approved water quality treatment options. The facility type and location will be selected in 2020. Design of the facility will take place between 2020-2021, with construction in 2022. Project Manager: Allison Speicher.

Maury Island Natural Area Remediation

King County Parks is coordinating with Washington State Department of Ecology to clean-up contaminated soil at Maury Island Natural Area. Air pollution from the Tacoma Asarco smelter settled on parts of King, Pierce, Kitsap, and Thurston counties, creating the Tacoma Smelter Plume. High concentrations of arsenic and lead from the smelter operations have been found in the Natural Area.

Read more about the Maury Island Natural Area remediation project.

Project Manager: Lindsey Miller

Mukai Cold Process Fruit Barreling Plant

King County purchased the Mukai Cold Process Fruit Barreling Plant, located on Vashon Island, in order to permanently protect this historic structure. The County entered into a lease agreement with Friends of Mukai, a nonprofit organization that controls the adjacent historic Mukai House and Garden. Project work includes assessment, evaluation, and interim repairs to stabilize the structure to prevent further deterioration. Estimated timeline for completion: Phase 1 Construction – December 2020 – February 2021 Project Manager: Brenda Bradford

Pathway and Parking Lot Surface Repairs

King County Parks is continuously repairing and improving the pathways, sidewalks and parking lots within our system of 200 parks. Repair work includes spot pavement repairs, removing tree roots and installing root barriers, controlling erosion, paving, and site restoration. This work typically doesn't require closure of park facilities.

Recently completed projects:

  • Tanner Landing Parking Lot improvement – 2020
  • Preston Ballfield Access Pathway – 2020
  • Maplewood Park Pathway improvement – 2020

Upcoming projects:

  • Northshore Pavement Repair – 2023

Project Manager: Annie Mathews

Pinnacle Peak Trailhead Development

Funded in part by a grant from the Washington Wildlife and Recreation Program, this project constructed a 50-vehicle parking lot and trailhead amenities on the south side of the park along SE Mud Mountain Rd. Other project elements include constructing an access trail and bridge that connects the trailhead to the existing trail network and restoring pastureland. The 2014-2019 parks levy has the goal of expanding access to recreation by improving/constructing trailheads, and this project helped advance our progress on that goal.

Project Manager: Linda Frkuska

Play Area Rehabilitation

We have 29 play areas in our parks. We conduct annual safety inspections and remove, replace and/or modify play areas as needed for safety and life cycle maintenance. Each play area rehabilitation project takes approximately 8 to 10 weeks to construct; however, construction is weather dependent and is subject to change. We met our goal of rehabilitating 13 play areas as part of 2014-2019 levy, including improving ADA access at nine of them.

During the 2020-2025 King County Parks, Recreation, Trails and Open Space Levy, our goal is to improve seven play areas including:

Under construction:

  • Dockton Park - Temporary resurfacing (Completed June 2021); Comprehensive renovation - 2022; Full renovation tentatively scheduled for summer/fall 2022 pending receipt of permits.

Future projects:

  • Preston Athletic Fields (curbing, drainage, and ADA access only) - In final design; Construction planned fall 2022
  • Boulevard Lane Park - planned for 2023
  • Maplewood Park - planned for 2024
  • Big Finn (climbing net only) - planned 2025
  • Marymoor North 2-5 age area (surface replacement only) - planned 2025

Completed projects:

  • Marymoor North 5-12 age area - 2020

*Note: Skyway Park – Play area replacement is part of a larger park improvement project. See below for updates.

Project Manager: Josh Tasler

Regional Trails System Improvements

With 175 miles of regional trails, King County Parks is continuously repairing and improving our existing paved and soft surface trails and other trail amenities. Surface repairs, such as removing tree roots, leveling bumpy patches, and replacing worn out areas, are on-going and sometimes require brief trail closures.

Completed projects:

  • Marymoor Connector Trail Bridge Approach repair – 2020
  • Sammamish River Trail Chicken Lot to Bridge 2156-6 pavement repair – 2020
    Sammamish River Trail between NE 116th and NE 124th pavement repair – 2020
  • Issaquah Preston Trail between 1st Ave and Front Street in Issaquah pavement repair - 2020
  • East Lake Sammamish Trail between State Park Boat Launch and Black Nugget pavement repair – 2020
  • Sammamish River Trail between NE 124th and NE 145th pavement repair – October 2021

Upcoming projects:

  • Burke Gilman Trail between 47th Ave NE and 61st Ave NE pavement repair – 2022~2023
  • Sammamish River Trail between Rusty Bridge and NE 85th St pavement repair - 2022~2023

Project Manager: Annie Mathews

Skyway Park

Visit our project page.

Soos Creek Trail

[Coming Soon]

Steve Cox Memorial Park

As one of the oldest sites in the system and a much-loved park, Steve Cox Memorial Park requires on-going repair and upkeep for the safety and operation of the park’s buildings and other recreational facilities.

Sign up for the park e-newsletter (low traffic) to stay up-to-date on what's happening in the park!

The synthetic turf conversion project is now complete! The project installed a multi-use synthetic turf athletic field with LED lights and a ten-foot-wide paved walking path around the field perimeter. The field in-fill is a rubber turf material coated with a colorant and encapsulated with a polyurethane coating. This material was selected to help reduce on-field temperatures and the overall environmental impact of the in-fill. 

Read the project brochure (English / Spanish) for more information.

Current projects:

  • Tennis Court LED Light Conversion: The existing flood lights and security lights around the Steve Cox Tennis courts were installed in the 1970s, and have reached the end of their useful service life. Many are currently burnt out and in need of replacement. The existing units will be replaced with new, energy saving LED fixtures. Project Manager: Allison Speicher. (Fall 2019).
  • Community Center Basement Rehab Project  -  Complete remodel of restrooms and new flooring throughout basement is complete.  Other interior repairs and paint will be worked in around the Teen Center Programs and reservations as to not impact the daily use by the community.  New shelving has also been installed in a reconfigured large storage room to help the Teen Program reorganize their supplies for easy access.  This project will be ongoing until the end of the year.
Completed projects include:
  • Upgrade fiber optic network in buildings (Summer 2017)
  • Install underground electrical power to field house (Summer 2017)
  • Repair and repave parking lot; repair sidewalk; install ADA ramps (Spring 2017)
  • Renovate stadium (Spring 2017)
  • Install LED lights to outdoor basketball courts (Fall 2015)
  • Replace roof of racquetball building (Spring 2015)
  • Replace lighting controller improve remote field lighting for scheduled events Project Manager: Allison Speicher. (Winter 2019)

Project Manager: Tri Ong

Sunset Park Soil Remediation

To ensure continued public safety, King County and the City of SeaTac will remove soil from legacy contamination on approximately 1.25 acres on two ballfields and restore the area with clean material.

The contamination includes arsenic and lead that is present across a wide swath of northern Pierce County and southern King County from the former Asarco Smelter in Tacoma, as well as pollution from previous uses on the property.


  • Spring/Summer 2021: Design and permitting
  • Winter 2021: Project solicitation for public bid
  • Spring/Summer 2022: Construction

The park will remain open and will be closed during the 60-90 days of soil remediation construction in 2022.

Project Manager: Shazaad Jarrahian

Taylor Mountain Forest Trail Bridge Improvements

Funded in part by the NOVA grant program, this project will maintain the integrity of Taylor's 30-mile trails system and protect natural resources, including salmon-bearing streams, by removing culverts and replacing trail bridges and making other trail improvements.

The first phase of the project includes replacing 2 trail bridges along Road A. Construction is expected to last from August 2021 to early October 2021.

For more information about the bridge and trail improvements:

Sign up to receive updates about Taylor Mountain Forest here.

Project Manager: Catherine Maggio

Weyerhaeuser King County Aquatic Center

With three pools, locker rooms, a banquet hall, concession area and 2,500-seat natatorium, the WKCAC is one of the nation’s premier swimming and diving facilities and requires on-going upkeep by King County Parks. Recent upgrades include installing energy efficient lighting, replacing the HVAC system, replacing the scoreboard, installing a lobby video wall, and replacement of the skylights in the main natatorium.

Upcoming projects include:

  • Elevator Modernization
  • Security System Upgrades
  • Event Camera Replay System Upgrades
  • Recreation Pool PoolPak Replacement
  • Continued improvements for energy efficiency
  • Other general on-going maintenance and upkeep

Project Manager: Josh Tasler