Fall River Cutoff is a short 0. 4-mile connector trail located just south of Yellowstone National Park on the Grassy Lake Road, providing access to the Terraced Falls Trail and Mountain Ash Creek Trail system.

The trail begins at a parking area on the north side of the gravel road and drops 140 feet while paralleling Cascade Creek, making it an easy access point for hikers exploring the remote Fall River basin area.

This location serves as a gateway to backcountry trails leading to waterfalls and the Falls River, though visitors should note that access roads close seasonally in winter.