Fish Lake-Mountain Ash Spur Trail

Dogs No Dogs

Features Lake · River/Creek

This is a short 1.2 mile spur trail from (the tough to reach) Fish Lake Trailhead to the South Boundary Trail: Grassy Lake Road-Bechler RS and the Fish Lake-Mountain Ash Cutoff Trail.The trailhead is found southwest of Fish Lake, which itself is reached by a 1.5 mile high-clearance vehicle spur road on the north side of the Flagg-Ashton NFS Road (also called the Grassy Lake Road) about 18 gravel-road miles west of Flagg Ranch.

Most runners (and horse parties) using this trail are headed to spectacular 250-foot Union Falls. It offers the shortest route to the falls. From the trailhead it's just 7.1 miles away.

Thanks to guidebook author, Tom Carter, for sharing this trail description. To learn more about visiting Yellowstone, check out his book, Day Hiking Yellowstone.