Westcrest Park Drainage Improvements

Updated: September 12, 2019

Summer/Fall 2019

There have been ongoing drainage and erosion concerns at the Westcrest OLA, since at least 2016. Seattle Parks and Recreation (SPR) is proposing to undertake maintenance activities in and around the Westcrest Park OLA to address these problems. SPR will also be taking this opportunity to bring the north parking lot into compliance with current accessibility standards.

SPR is in the process of refining the design and acquiring the necessary permit. The revised design will solve the drainage and erosion issues while providing a better user experience for all users.

Construction will begin in the spring of 2020 and we anticipate completion by fall. Due to safety for all and the scope of the project, the north parking lot and the entire OLA will be closed for the duration of construction. We understand the impact this will have on the OLA and are endeavoring to keep the shy/small dog use area open for everyone's use during most of the construction. Also you can find a list of all 14 Off-Leash Areas on the Dog Off Leash Areas webpage. 


Westcrest Park, 9000 8th Ave SW, 98106


The Seattle Park District Major Maintenance and Asset Management Fund provides $505,000 in funding for this project.  


Planning and Design: Spring 2018 - Winter 2019/20
Early 2020
Spring - Fall 2020

Project Description

The scope of the project includes:

  • Stabilizing areas of erosion on trails and down steep slopes.
  • Improving conveyance (e.g. rock-lined swales, concrete swales and HDPE piping) and outfalls to reduce potential for erosion.
  • Restricting dog and pedestrian access in sloped areas with additional fencing to reduce further loss and allow re-establishment of ground cover.
  • Regrading major use areas to reduce runoff velocities and the potential for erosion and sediment transport.
  • Stabilizing the dog play area surfaces with a well-draining mineral aggregate.
  • Constructing sediment traps to reduce transport of surfacing materials and improve water quality.
  • Relocating discharge points from tops of slopes to bottom of slope for full dispersion in the forest.
  • Providing accessibility improvements in the north parking lot and the north entrance.

Community Participation

Seattle Parks and Recreation (SPR) has determined that the project does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with SPR. This information is available to the public on request. The Determination of Non-Significance was issued June 3, 2019.
Download the DNS document for additional information.