The Bechler River Trail and Boundary Trail/Grassy Lake Trail provide access to Yellowstone's remote southwest corner via the Bechler Ranger Station (accessible via Cave Falls Road from Idaho) or from Grassy Lake Road in Wyoming.

These trails offer backcountry hiking and fishing access to the Bechler River and Fall River area, though the region is notably wet and marshy with hazardous river crossings; permits are required for overnight camping and fishing, and the area is best visited in late summer to avoid high water and dense mosquitoes.