Thielsen Creek Trail passes through mountain hemlock and true fir stands while paralleling Thielsen Creek most of the way. Fragile pumice openings become larger and more frequent as the trail nears timberline. Thielsen Creek Camp is located just south of the trail, .2 miles from its junction with the Pacific Crest National Scenic Trail. This is a popular camping spot with water and a magnificent view of the backside of Mt. Thielsen. This trail is popular with the Nordic skiers in the winter time; no motorized vehicles allowed.

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Directions: From Prospect: Travel north on Highway 230 to its junction with Highway 138. Continue on 138 and turn west onto Road 4795, the north entrance to Diamond Lake Recreation Area. Follow 4795 .3 miles to the Howlock Mountain Trailhead on the left. The Thielsen Creek Trail intersects the Howlock Trail 3.5 miles out.

Seasonal Access: Normally Open: Summer-Winter

Facility Type: Trail