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Parks Capital Improvements

Parks Capital Improvements

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 and Sport Court Rehabilitation Program

King County Parks is addressing emergent needs at existing priority grass ball field facilities throughout King County Parks system. Work includes one or more of the following: subgrade/drainage repair, conversion to synthetic turf, fencing, minor or major court repairs or resurfacing, and ADA accessibility improvements. New lighting systems may also be installed, providing greater energy efficiency and safe, uniform lighting levels for the users. 

Upcoming projects:

  • Sunset Park Soil Remediation 
  • Mel Olson Stadium outfield conversion to synthetic turf – Construction is estimated for  2022 or 2023. Project Manager: TJ Davis
  • Big Finn Baseball Fields 1-3 Improvements.  Work includes fencing repair at select location, dugout privacy slats, dugout gates, bullpen fence fabric, asphalt crack sealing, select trees pruning and removal at Field 1, and mow strips at Field 3. – Construction is estimated for 2022 or 2023. Project Manager: Jon Polka
  • Petrovitsky Baseball Fields 3 & 4 drainage improvements – Construction is estimated for 2025. Project Manager: Jon Polka

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.

Completed projects:

  • Preston Park Soccer Practice Fields 1 & 2 - June 2022.

Future projects:

  • Petrovitsky Soccer Fields 1 & 2 – Construction is estimated for summer 2023
  • Ravensdale Park Baseball Infield 1 and Multipurpose Field 4 – Construction is estimated for 2023
  • Preston Park Soccer Field 3 – Construction is estimated for 2024
  • Redmond Ridge Fields 1 &2 – Construction is estimated for 2024
  • Ravensdale Park Fields 2 & 3 – Construction is estimated for 2025

Project Manager: Claire Jonson

Bridge and Trestle Program

There are 97 bridges and trestles in King County's Regional Trails System, many of which are over 100 years old. King County Parks inspects, monitors, load rates, repairs, rehabilitates and replaces these structures on an on-going basis.

Recently Completed projects:

  • Replacement of the Snoqulamie Valley Trail (SVT) bridge near Remlinger Farm in Carnation (Completed Spring 2021)
  • Cedar River Trail Bridge #10 stringer repair near Maple Valley – 2021
  • VT Bridge #16 – south of Duvall rehabilitation of substructure  – 2021

Current and upcoming projects include:

  • Bridge (2156-7) Rail Replacement on Sammamish River Trail near Blyth Park in Bothell 
  • Bridge (2178-21) stringer repair on Snoqualmie Valley Trail north of Carnation 
  • Large Woody Debris removal from the Tolt River Bridge on the Snoqualmie Valley Trail
  • Design of a replacement structure for the #2 bridge (PST-2) 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 near Rattlesnake Lake
  • Annual Bridge Inspections
  • Response to emergent bridge projects as needed

Program Manager: Shazaad Jarrahian

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 by the 2014-2019 King County Parks, Trails, and Open Space Replacement Levy and by a grant from the state Recreation and Conservation Office, this project will construct a new trailhead parking area for Cougar Mountain Reginal Wildland Park off Newport Way NW near Issaquah. This project has been delayed and the scope downsized due to complicated regulatory requirements associated with the critical areas (streams and wetlands) on the site; however, this project is now in the Final Design and Permitting Phase with permit issuance expected by the end of 2022 and construction estimated to start in early 2023.

Newport Way Pedestrian Bridge and Raised Intersection - City of Issaquah

Notice of Action Taken (NAT)
SEPA Checklist
Project Vicinity Map

Project Manager: Linda Frkuska

Derby Creek Flood Reduction and Enhancement Project

This project was completed in 2022. The 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:

It was funded in part by grants from the King County Flood Control District and Cedar Sammamish Lake Washington Watershed. 

Project Manager: Colin Worsley

Dockton Park Improvements

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

Dockton Moorage Replacement (Phases 1 and 2)

Phase 1 is complete. Marina is reopened with moorage for up to 30 boats. Latest information.

    • Completed in May 2022, this phase replaced various piles and finger piers internally on the dock.  Other improvements include new fire suppression system, sewage pump out station, hardware replacements, nonskid coating and fixed pier cross bracing replacement (under bathroom)

Phase 2 is in final design

  • This phase will include removal and replacement of deep-water creosote piles, replacement of breakwater section of floating dock, and replacement of the boat ramp dock.  Construction is estimated for 2024. Project Manager: David Dahl

Dockton Moorage Replacement documents

Project Manager (Phase 2 construction): David Dahl

Dockton Park Play Area Rehab – See Play Area Rehab Program below.

East Lake Sammamish Trail


Five Mile lake Park

This program will fund infrastructure improvements at Five Mile Lake Park, one of five sites identified for major investment in the 2020-2025 Parks Levy. 

Upcoming projects:

  • Five Mile Lake Parking Lot repair, overlay, and lights – Construction is estimated for 2024.

 Project Manager: Jon Polka

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).  

Completed projects:

  • Tanner Landing Parking Lot improvement – 2020
  • Preston Ballfield Access Pathway – 2020
  • Maplewood Park Pathway improvement – 2020
  • Steve Cox Basketball Courts resurfacing and fencing – 2021. 
  • Marymoor Water System Evaluation – 2022.
  • Current and upcoming projects include:
  • Steve Cox Field and Pathway Repairs 
  • Steve Cox Playground Net 
  • Steve Cox Tennis Court Resurfacing and ADA improvements
  • Dick Thurnau Pathway repair
  • Dick Thurnau Restroom Replacement
  • Coalfield Parking Lot repair and overlay 
  • White Center Pond NA Pathway repair
  • Tolt MacDonald Mariner Parking Lot repair and overlay 
  • Tolt MacDonald Park Restroom ADA Access
  • Ravensdale Sewage Upgrade Feasibility Study

Project Managers: Lindsey Miller and Tri Ong

Interurban Trail South Improvement

Identify, design, permit, and implement emergent capital, major maintenance, and safety repairs at priority locations along the corridor to ensure trail usability and safety. 

Upcoming projects:

  • Interurban Trail – Pacific., 2022 or 2023.
  • Interurban Trail – Algona, Auburn, Kent, and Tukwila, 2024 or 2025

Project Manager: Mark Fisher

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 parking area and amenities to support outdoor recreation and community gatherings. The parking area, 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 parking area construction, park amenities, funded by the Recreation Conservation Office’s Washington Wildlife and Recreation Program, will be constructed and will likely include a combination of a natural 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

Project Manager: Mary Lear

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:

  • Marymoor covered equipment shelter – June 2022
  • HVAC Upgrades/Replacement at Clise Mansion – August 2021

Current and upcoming projects include:

  • Marymoor Ballfield Safety Fencing 
  • Water main double check valve assembly installation and pressure reducing valve repair
  • Water supply improvements and extension
  • Connector Trail extension from Redmond light rail station (in partnership with Sound Transit) – Trail opening to coincide with new Light Rail station opening 
  • Marymoor Stormwater Treatment Facility – Design, permit and construct a stormwater treatment facility in Marymoor to treat approximately 1.9 acres of existing pollution generating impervious surfaces 
  • Marymoor Pump Station (Sewer Lifts) Assessment
  • Marymoor Water Main Replacement (planning and/or design only)

Program Managers: Lindsey Miller and Tri Ong

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

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:

In Progress:

  • Preston Athletic Fields (curbing, drainage, and ADA access only) – Final design complete and permits in hand. Construction estimated for late 2022.
  • Dockton Park - Temporary resurfacing (Completed June 2021); Comprehensive renovation is in design. Construction estimated for Fall 2023 pending receipt of permits. More information
  • Boulevard Lane Park – Planning is underway with construction estimated for 2023

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

Preston Snoqualmie Trail Bridge #2

This project is part of the Bridge and Trestle Program that inspects, monitors, load rates, repairs, rehabilitates and replaces these structures on an on-going basis.

  • Preston-Snoqualmie Trail Bridge #2 (about 0.75 miles east of the Preston-Snoqualmie Trailhead parking lot) sustained serious damage during the winter of 2022. A large tree fell onto the bridge and several support piles shifted so that they are no longer supporting the bridge.  This bridge is currently closed to all
  • The bridge is currently in design and is slated for a full replacement.  Construction in anticipated in 2024. King County Parks is also evaluating if temporary repairs are possible to reopen the bridge in the interim

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, installing root barriers, leveling bumpy patches, and replacing worn out areas, are on-going and sometimes require brief trail closures.

Completed projects:

  • Cedar River Trail access control, striping, and signage from Renton to SR18 – 2021
  • Sammamish River Trail between NE 124th and NE 145th pavement repair – October 2021
  • Burke Gilman Trail between 47th Ave NE and 61st Ave NE pavement repair – June 2022

Upcoming projects:

  • Eastlake Sammamish Trail north of NE 65th St pavement repair 
  • Sammamish River Trail between NE 145th to NE 147th pavement repair 
  • Sammamish River Trail between Rusty Bridge and NE 85th St pavement repair 
  • Preston Snoqualmie Trail at 400 feet west of end of trail 
  • Soos Creek Trail spot repair and striping
  • Response to emergent projects as needed

Project Manager: Mark Fisher

Skyway Park

Visit our project page.

Solar Projects

An Economy and Climate Initiative sponsored and funded by the King County Council is providing Parks with funds to add solar lighting and energy in our Parks. Solar lighting will be added in select picnic shelters, pathways, parking areas, and trails throughout the Parks system. This project is intended to enhance safety. Two distinct projects are underway.

  • Solar Lighting and Energy for Picnic Shelters
  • Solar Safety Lighting on Parking Areas, Pathways & Trails 

Approximate Schedule:

  • Planning and Public Engagement/Outreach (Spring - Summer 2022)
  • Design and Permitting (Fall 2022 – Spring 2023)
  • Construction (Summer 2023 – Fall 2023)

Project Managers: Thomas Early and Darbby Te

Soos Creek Trail

The Soos Creek Trail will be extended from its current terminus at SE 192nd St. up to SE 186th St. with a backcountry connection to Boulevard Lane Park. The initial construction on this segment will be accomplished through a developer agreement and is slated to begin in September of 2022. 

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
  • August- October 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 and Jason Anglin

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.

Completed projects:

  • Two bridges along Road A 2 were installed in 2021

Current and upcoming projects include:

  • Plan, design, permit, and construct trail bridges along Beaver Pond trail.

For more information about the bridge and trail improvements:

Sign up to receive updates about Taylor Mountain Forest here.

Project Manager: Tom Early

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. Projects that are part of the 2020-2025 King County Parks, Recreation, Trails and Open Space Levy include:

Completed Projects:

  • Natatorium Skylight Replacement (2020)

In Progress Projects:

  • Elevator Modernization (Construction August 2022)
  • Pool Deck and Dive Tank Resurfacing (Construction August 2022)

Upcoming projects include:

  • Security System Upgrades (2022)
  • Banquet Hall Roof Replacement (2022)
  • Recreation Pool HVAC and Water System Replacement (2023)
  • Natatorium Lighting Replacement (2023)
  • Continued improvements for energy efficiency

Project Manager: David Dahl