Mountain bike route. The first 3/4 mile follows an old jeep road, then turns to single track, climbing up a forested slope before reaching a clearing caused by an avalanche in 1986. The trail then passes below Mammoth Rock, a massive limestone and marble monolith containing fossils estimated to be 250 million years old. Continue to the end of the trail, which intersects Old Mammoth Road.
At a Glance
Mammoth Lakes, CA
Directions: Trailhead is located on Shirwin Creek Road, one-half mile past Sierra Madows Ranch.