Green River Gorge Backcountry Access

The Green River Gorge backcountry access roads wind through some of the last intact old-growth forest in western Washington’s Cascade foothills, following the river through a landscape that feels more like the Olympic Peninsula than suburban King County. These interconnected forest roads drop down from Highway 18 through massive Douglas firs and western red cedars, eventually reaching remote swimming holes and granite gorge overlooks that few people ever see. The main route follows an old logging railroad grade, but several technical spurs branch off to hidden campsites along the river.

Difficult rating due to steep, narrow sections with loose rock and seasonal washouts—definitely 4WD territory with good skid plates recommended. The roads can be impassable during heavy winter rains and spring snowmelt. Summer and fall offer the best conditions, but even then expect muddy spots and tight squeezes through the forest. No permits required, but you’re entering state park backcountry where camping regulations apply. The payoff is world-class swimming holes, granite canyon views, and some of the most pristine forest within an hour of Seattle.