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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.


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.

In our 2014-2019 Levy we committed to repairing or replacing 14 bridges and trestles on our regional trails. By the end of 2017 we completed repairs and replacements on all 14of these bridges including:

  • A major rehabilitation on the 400-foot Tokul Creek bridge
  • Replacement of the Snoqualmie Valley Trail #40 bridge near Mt. Si Golf Course
  • Significant stringer and cap repairs to the numerous trestles along the Snoqualmie Valley and Cedar River Trails
  • A significant scour repair project on the Sammamish River Trail

For the remainder of the levy, we will continue to inspect and load rate our bridges, as well as  respond to immediate need projects such as scour repair and tree damage.  We will also work on planning and implementing several rehabilitation and replacement projects  including:

  • Replacement of the trail bridge that leads into Remlinger Farm near Carnation
  • 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

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 construction to replace the facilities, utilities, and yard storage areas at Parks’ existing operations headquarters (3005 NE 4th Street, Renton). Project includes re-development of approximately 5.7 acres with a new shop and crew spaces, vehicle and equipment parking, and yard/materials storage.

Parks issued a Determination of Non-Significance (DNS) under the State Environmental Policy Act (SEPA). Comments accepted until 4:30 pm on Dec 20, 2018. Click here for SEPA information.

Project Documents

King County Parks is issuing a Notice of Action Taken (NAT) for the King County Parks – Renton Shop project. As described in the NAT any action to set aside, enjoin, review, or otherwise challenge such action on the grounds of non-compliance with the provisions of chapter 43.21C RCW (State Environmental Policy Act) shall be commenced on or before March 28, 2019.

Notice of Action Taken (NAT)

City of Renton Hearing Examiner issued a Decision on Conditional Use Permit July 17, 2019.

Want more information? View project information here.


  • Design and permitting 2018 - 2020
  • Construction – 2020 - 2022

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
  • 2021 – Construction

Questions? Call (206) 477-4527 or email.

Cougar Mountain Regional Wildland Park – Coal Creek Culvert Replacement

King County Parks will close a portion of Clay Pit Road at Cougar Mountain Regional Wildland Park during a culvert replacement project at Coal Creek scheduled for Tuesday, September 8 to Friday, October 30, 2020. During the closure, please follow the Bypass Trail, located in C3/C9 on the map. 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 in the final design phase, which is funded in part by the King County Flood Control District. Permit applications will be submitted in Summer 2018. Construction of the project is dependent on permit issuance and available funding. King County Parks is pursuing possible partnerships to construct the improvements, but the construction date is still to be determined.


Project Manager:Lindsey Miller

Dockton Park Dock Rehabilitation

Funded in part by a grant from the state Boating Facilities Program, this project will replace and repair piles, install additional flotation to stabilize the dock, replace cross-bracing on the fixed pier and hinge points on the finger piers, and install a new sewer pump station, water lines on the dock, and signage.

This project is currently being re-focused to address more significant work needed to ensure public safety at the dock. King County Parks closed the marina to overnight moorage in April 2019 after the facility experienced significant and rapid deterioration after an unusually harsh winter. A small area open for day-use only. Read more about the closure here.

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 Francis Park Closed: June 8 – July 20, 2020

Improvements Ahead

King County Parks will be closing Lake Francis Park near Hobart from Monday, June 8 through Monday, July 20 to improve the parking lot, repair drainage issues, and remove some hazardous trees.


Questions? Call (206) 477-4527 or email

Lake to Sound Trail

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

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. The 2014-2019 parks levy has the goal of rehabilitating 13 play areas by the end of the levy period in 2019.

Under construction:

  • Petrovitsky Park (two play areas) - Anticipated re-opening, by Sept 30, 2019

Completed projects include:

  • South County Ballfields – Completed in August 2015
  • Cottage Lake Park – Completed in March 2016
  • Five Mile Lake Park – Completed in April 2016
  • Ravensdale Park – Completed in June 2016
  • Tolt MacDonald Park – Completed in September 2016
  • Big Finn Hill Park - Completed in December 2016
  • Coalfield Park - Completed in June 2017
  • Mayrmoor Park (south play area) - Completed May 2018
  • Dick Thurnau Memorial Park - Completed 2018
  • Redmond Ridge Park - Completed 2018

*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.

Recently 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 to Front Street in Issaquah pavement repair - 2020
  • East Lake Sammamish Trail between State Park Boat Launch and Black Nugget pavement repair – 2020

Upcoming projects:

  • Burke Gilman Trail between 47th Ave NE to 61st Ave NE pavement repair – 2021
  • Sammamish River Trail between NE 124th to NE 145th pavement repair – 2021~2022

Project Manager: Annie Mathews

Skyway Park

King County Parks is in the design and permitting phase for a project to improve recreation and sports facilities at Skyway Park.
This project will include the following elements:

  • enhancing and expanding the play area (north section)
  • adding a pre-fabricated modular outdoor mini soccer arena (north section)
  • adding on-demand lighting to the sports court
  • adding a new paved, ADA accessible pathway (north section)
  • repairing existing pathway
  • adding parking spaces
  • enhancing baseball diamond (north section)
  • adding security lighting along pathway
  • upgrade fencing

Construction will likely start in 2020. This project is funded by the King County Parks' Youth and Amateur Sports Grants program and by the Land and Water Conservation Fund - Outdoor Recreation Legacy Program.

The following documentation is available for this project:

Budget: $1.3 million
Project Manager: Mary Lear 

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!

Current projects

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

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 and installing a lobby video wall.

The following capital project is in progress and we anticipate completion sometime in December:

  • Rehabilitation of the skylight system above the main natatorium

Other current projects include:

  • Monitoring the HVAC system in the recreation pool 
  • Other general on-going maintenance and upkeep

Project Manager: Matthew Perkins