Seattle, WA: Boulder River Trail

This all-season, 7-mile loop in the Boulder River Wilderness gently ascends through fast-growing (and fast-falling) alders, fragrant cedars, and rugged Douglas firs.
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This all-season, 7-mile loop in the Boulder River Wilderness gently ascends through fast-growing (and fast-falling) alders, fragrant cedars, and rugged Douglas firs.

Trail Facts

  • Distance: 11.3

Waypoints

BRT001

Location: 48.250655, -121.815441

Trail begins along old roadway

BRT002

Location: 48.249912, -121.822586

Trail angles W toward creek valley

BRT003

Location: 48.24351, -121.826813

Enter Boulder River Wilderness Area

BRT004

Location: 48.242167, -121.825869

View fantail waterfall W across Boulder River

BRT005

Location: 48.240868, -121.820908

Alder forest gives way to hemlock, fir, and scattered cedar

BRT006

Location: 48.237423, -121.811557

Long traverse through old second-growth forest. Look for signs of pre-chainsaw logging, like stumps with spring-board notches

BRT007

Location: 48.233106, -121.801944

Begin steepest climb of hike

BRT008

Location: 48.229218, -121.796193

High point of trail (1,500 ft.)

BRT009

Location: 48.226593, -121.79039

Trail nears creek briefly; good spot to picnic or refill bottles

BRT010

Location: 48.223915, -121.78673

Trail end at river. A bridge fell decades ago and hasn't been replaced; good campsites @ riverside. Retrace your steps to return to car