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Natural Resources and Parks
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Trailhead reopens at Cougar Mountain Regional Wildland Park after King County repairs small sinkhole in parking lot


The Red Town Trailhead and parking lot at King County’s Cougar Mountain Regional Wildland Park is open to public access following a brief closure to repair a sinkhole.


Hikers, trail runners and wildlife enthusiasts can once again access King County’s Cougar Mountain Regional Wildland Park from the Red Town trailhead after crews investigated and repaired a small sinkhole that first appeared in the trailhead parking lot in mid-September.

King County closed the Red Town trailhead Oct. 25 after the sinkhole grew from about 12 inches across to roughly 4 feet across following heavy rainfall.

Because of extensive historic coal-mining activity at Cougar Mountain and throughout the surrounding area, King County partnered with experts from the Office of Surface Mining to determine if the sinkhole was related to past coal-mining work. To help ensure public safety, King County closed the trailhead while the sinkhole was investigated.

Earlier this week, engineers determined that the sinkhole was not related to mining activities and was instead related to poor quality fill. Crews have filled the sinkhole with clean material, clearing the way for the trailhead to reopen to public use.


Cougar Mountain Regional Wildland Park

Doug Williams, King County Department of Natural Resources and Parks, 206-477-4543

About King County Parks
King County Parks - Your Big Backyard - offers more than 200 parks and 28,000 acres of open space, including such regional treasures as Marymoor Park and Cougar Mountain Regional Wildland Park, 175 miles of regional trails, 215 miles of backcountry trails and a world-class aquatic center. King County Parks cultivates strong partnerships with public, private, and non-profit entities that leverage public dollars, enhance public recreation opportunities, and involve King County residents in the stewardship of King County’s open space and recreation assets.