Welcome to Diamond Lake

Rising to the east of Diamond Lake is pointy Mt Thielsen, a 9182ft basalt spire. A 5-mile trail (10 miles round-trip; Northwest Forest Pass required or pay $5 on-site) begins 1 mile north of the junction of Hwys 138 and 230 and stops 80ft short of the summit, which is attainable only with technical climbing skills.

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Travel guides

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Diamond Lake in detail