Fall River Idaho Fly Fishing, Camping, Boating

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Fall River

The Fall River is situated in Idaho, in Yellowstone National Park's southwestern corner. While not as well known as other rivers in the area, it's a wonderfully remote destination for avid anglers and hikers.

What can I do and see on the Fall River?

Known for great rainbow and cutthroat trout fishing, the Fall River is a backcountry angler's paradise. Access the river either from the end of Cave Falls Road or Grassy Lake Road.

  • Cave Falls Road: From Asthon, Idaho drive east on ID-47 toward Mesa Falls and turn right onto Cave Falls Road just out of town. The Fall River is easily accessible from the end of the road.
  • Grassy Lake Road: It's the only road that cuts through the parks from west to east. From Cave Falls Road, follow signs to Grassy Lake Road/Asthon-Flagg Ranch Road. Park below the Grassy Lake Reservoir Dam and hike to the upper reaches of the Fall River.

The southwest corner of Yellowstone National Park is well known among backpackers. Take a week and connect Cave Falls Road to Old Faithful.

Giving the river its name, there are a handful of spectacular waterfalls along the Fall River. Cave Falls (20 feet) is the most accessible, located right at the end of Cave Falls Road.

Where is the Fall River?

The Fall River runs from just above the Grassy Lake Reservoir in Wyoming (between Yellowstone and Grand Teton Parks) until it meets up with the Henry's Fork of the Snake River near Ashton, Idaho. It is accessible via Cave Falls Road or Grassy Lake Road.