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Through 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 2014 - 2019 King County Parks, Trails, and Open Space Replacement 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.

Looking for CPG projects? Click here.

Bridge and Trestle Program

There are 86 bridges and trestles in King County's Regional Trails System, including 15 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 2016 we will have completed repairs and replacements on 10 of these 14 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 our inspection program, as well as completing at least 4 more repairs and replacements, 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.)
  • Tolt-MacDonald Park Additional Suspension Bridge Repair
Project Manager: Jason Rich

Building Structures Program


On-going assessment, evaluation, rehabilitation or replacement of existing park buildings, facilities and systems in order to ensure safety of the public and staff.


Completed projects include:

  • Gracie Hansen Roof Replacement  
  • Tolt Barn Siding Replacement

Upcoming projects include:

  • Tolt Barn Roof Replacement – Project Manager: Mari Gregg
  • Cougar Squak Corridor Water Supply Replacement and Treatment System – Project Manager: Brenda Bradford

Burke-Gilman Trail - Lake Forest Park Improvements

This project is now complete. Read more about it here.

Central Maintenance Facility

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


Estimated timeline for completion:

  • Utility Construction Winter – 2018-2019
  • Building Construction – Summer 2020

Project Manager: Brenda Bradford

Cougar Mountain Regional Wildland Park – Big Tree Ridge 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 will construct 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 40-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.


  • Fall/Winter 2017 – Preliminary Design
  • Late Spring 2018 – Permitting
  • Fall 2018 – Final Design
  • Fall 2018 / Spring 2019 – Construction

Project Manager: Linda Frkuska

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.

The first phase of the project will include demolition of the existing lodge, office building, and several sheds. Campground remnants from the former property owners will be removed and restored with native vegetation. The existing parking lot will be redesigned to allow for more vehicle capacity and efficiency. Other project elements include installing a restroom, signage, landscaping, storm drainage, and mitigation plantings. Construction is anticipated to begin Spring 2019, depending on permitting.

The second phase will include installation of a natural play area and gathering space, an outdoor shelter, and an additional parking lot (if needed). Timing of the second phase of construction of is yet to be determined.

Project Manager: Linda Frkuska

Derby Creek Flood Reduction and Habitat Enhancement

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 project is currently in design, which is funded in part by the King County Flood Control District. King County Parks is pursuing additional grants and partnerships to fund construction of the project in 2019 or 2020.

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 on hold, pending negotiations with the Washington Department of Natural Resources.

Project Manager:Jason Rich

East Lake Sammamish Trail

Eastside Rail Corridor Trail

Facility Improvements

With 200 parks, 22 restrooms, 26 picnic shelters, 60 parking lots, and 3 historic buildings, it takes a lot of on-going maintenance to keep our facilities operating safely and efficiently so they can remain open for the public to enjoy.

Examples of general facility maintenance includes repairing roofs and restrooms, re-surfacing sidewalks and walkways, and maintaining building systems (ex: HVAC).

Project Manager: Frank Overton/Annie Mathews

Foothills Trail

King County Parks is initiating the design and construction of a one-mile segment of the Foothills Trail (formerly known as the Enumclaw Plateau Trail) along right-of-way owned by King County Parks. The trail segment begins at 252nd Avenue South, just outside and south of Enumclaw, and continues along a former railroad route to its terminus just north of Mud Mountain Road. King County Parks is working with the Cities of Enumclaw and Buckley to construct a bridge across the White River to connect both sides of the Foothills Trail.

King County Parks completed Phase I in 2010 of Foothill Trail development, constructing a soft surface trail on a one-mile segment of the trail from 252nd Ave S to just north of Mud Mountain Road near Enumclaw. Phase I also included improving the crossing at 252nd Ave S and installing a new pedestrian footbridge over a small stream that bisects the trail.

Read the 2008 White River Bridge feasibility study.


Foothills 60% Project Design Plans:

Project Manager: Chris Erickson

Green River Trail - North Extension

Green to Cedar Rivers Trail

Lake to Sound Trail

Marymoor Park

As our most popular park, Marymoor sees more than three million visitors every year, and 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.

CIP projects include:

  • Concert stage roof repair - completed in 2015

  • Concert pathway upgrade for ADA access - completed in 2016

  • Added netting at baseball field #1 to prevent foul balls from landing in the play area - completed in 2016

  • Electrical and utilities upgrades at parking lot D - completed in 2016

  • Concert seating area flooring – completed in 2017

  • Parking lot B entrance widening – completed in 2017

  • Replacement of synthetic turf on soccer fields – completed in 2017

  • Habitat restoration mitigation and monitoring for the Connector Trail (on-going)

Upcoming projects include:

  • Install new pay stations and parking enforcement system - currently in planning/pre-design phases, to be completed in 2017-18
  • Park office roof repairs - Anticipated for 2017-18 
  • Installation of security system - anticipated for planning and design in 2017-18
  • Upgrades to ADA pathways and lights - anticipated for planning and design in 2017-18
  • Audubon trail pavement repair – anticipated for 2017-2018

Project Manager: Annie Mathews

Marymoor Park Office Improvements

Feasibility and planning for renovation and addition to the Historical “Cottage” which functions as the administrative headquarters for the Park.


Estimated timeline for completion:

  • Planning – Fall 2017

Project Manager: Jennifer Kim

Mukai Cold Process Fruit Barreling Plant

King County recently purchased the Mukai Cold Process Fruit Barreling Plant, located on Vashon Island, in order to permanently protect this historic structure.The County intends to enter 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:

  • Construction Winter – 2018-2019

Project Manager: Brenda Bradford

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 remediation project here.

Project Manager: Lindsey Miller

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.

Current projects:

  • Lake Geneva Park - starting March 20, 2017, pending weather. Estimated completion time: 20 days.

Project Manager: Tri Ong

Pinnacle Peak Trailhead Development

Funded in part by a grant from the Washington Wildlife and Recreation Program, this project will construct 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 a one-half mile-long access trail and puncheon bridge that connects to the existing trail network and restoring pastureland.

Update October 19, 2016: Construction began in October, and King County Parks contracted with Pivetta Brothers Construction Inc. to construct the parking lot. The trail connection will be developed by our Backcountry Trails Crew. The parking lot is anticipated to be complete by November 2016, with trail construction and on-site restoration to be completed in Winter 2017.

Update July 27, 2016: Additional funding was appropriated in the 2016 supplemental budget, and the parking lot portion of the project will be constructed this fall. It is anticipated that the trail connection, site restoration and interpretive signs will be completed in the Spring 2017. The parking lot facility will open when all project components are complete.

Update July 22, 2015: The current project estimate exceeds the estimated project budget. Additional funding will be requested in the next budget cycle (2017-2018) in preparation for an early 2017 construction.

Project Documents

Project Manager: Linda Frkuska

Play Area Rehabilitation

There are 29 play areas in parks throughout King County’s system. King County Parks conducts annual safety inspections and removes, replaces and/or modifies 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 current levy funds rehabilitation of 13 play areas through 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

Upcoming projects include:

  • Marymoor Park (south play area) – Starting Fall 2017
  • Dick Thurnau Memorial Park - First half of 2018
  • Redmond Ridge Park - Second half 2018

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

Estimated project budget for 2015-2016: $1.1 million

Estimated project budget for 2017-2018: $1.03 million


Project Manager: Lindsey Miller

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.

2017 projects included:

  • Soos Creek Trail asphalt overlay
  • Sammamish River Trail surface repairs
  • Issaquah to High Point Trail soft surface improvements
  • Other emergent repairs throughout the system as needed

This program will be extended in 2018 with additional pavement overlays in other areas throughout the Regional Trails System.

Project Manager: Jorge Sanchez

Skyway Park

King County Parks is in the planning phase for a project to improve recreation and sports facilities at Skyway Park.

This project will likely include the following elements:

  • enhancing and expanding the play area
  • adding a pre-fabricated modular outdoor mini soccer arena
  • improving the parking lot and pathway
  • repairing existing sports facilities throughout the park

Timeline for this work is being coordinated with the Skyway Water and Sewer District, which will require use of part of the park for a sewer improvement project. Construction will likely occur in phases starting in mid to late 2018 and in coordination with the Skyway Water and Sewer District. This project is funded by King County Parks' Youth and Amateur Sports Grants program.

Budget: $1 million

Project Manager: Lindsey Miller

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.

Recent Projects

  • 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)
Upcoming projects

Synthetic turf field conversion and other improvements of Fields #2 and #3:

King County issued a Determined of Non-significance (DNS) under the State Environmental Policy Act (SEPA) for the Steve Cox Park Synthetic Turf Field project. Comments will be accepted until 4:30 PM on July 5, 2017. Please see the DNS for instructions on how to submit comments.

 Infrastructure projects:

  • Upgrade fiber optic network in buildings (Summer 2017)
  • Install underground electrical power to field house (Summer 2017)

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 have included installing energy efficient lighting and scoreboard, replacing the HVAC system, repainting the pools, and improving the locker rooms.

2016 rehabilitation projects included:

  • Replacing starting blocks
  • Resurfacing bulkheads
  • Other general on-going maintenance and upkeep

Project Manager: Mari Gregg