Otter Lake Trail

Otter Lake is an approximately 18-mile out-and-back from the Clarks Fork trailhead to a remote alpine lake. Plan on roughly nine miles each way and about 10 to 12 hours on foot; at nearly 9,800 feet, this is a strenuous day hike or an overnight trip, not a quick lake stop.

Follow the route to Russell Lake, then head east about three miles toward Otter Lake. The mapped route reaches the lake’s southeast shore; turn around there and retrace the same corridor. Keep an offline map handy at the junctions, since trail names and branches in this area can be easy to mix up.

The one-way approach gains about 2,210 feet and loses about 550 feet. Returning by the same route adds the descent back and another climb, for roughly 2,760 feet of total uphill. The high elevation, distance and remoteness make an early start and a realistic turnaround plan important.

The lake covers about 61 acres, with some rocky campsites and some firewood reported nearby. The fish record is mixed: brook trout are listed, but recent survey notes report no catches and future stocking on hold, so do not count on fishing. Treat any firewood or campfire plans according to current wilderness and fire rules.

Start beside Clarks Fork Picnic Area, about four miles east of Cooke City on US 212. The area has open parking, but potable water is unavailable and restroom details are not posted. Access is seasonal and weather dependent; snow can linger at high elevations into early or mid-summer. Check current road and trail conditions, carry water and layers, and bring bear spray where it is quickly accessible. Dogs may come along but must stay under control.