Fall River

The most significant tributary of the Henrys Fork, Fall River, traces its origins back to the southwestern corner of Yellowstone National Park. It’s a freestone stream, often overflowing its banks during spring runoff and low flows during the peak of the summer season. Flowing north for approximately 64 miles before its confluence near Ashton, Idaho, the Fall River carves a scenic path marked by numerous cascades and waterfalls in its upper reaches within Yellowstone, most notably the accessible Cave Falls and the multi-tiered Terraced Falls. This wild and picturesque beginning sets the stage for the river's character as it journeys into Idaho. 

The fishing on the Fall River in Idaho offers a rewarding experience for anglers seeking wild trout in a more secluded setting. The fishing generally peaks from mid-July, after the spring runoff has subsided, and can remain productive well into the fall. While the upper sections within Yellowstone offer a more remote experience with wild Rainbows and Cutthroat Trout, the lower reaches in Idaho, accessible via various county roads, provide opportunities to catch Cutbows and larger trout, including some Brown Trout near the confluence with the Henrys Fork. 

The character of the Fall River lends itself to challenging wading and anglers should be mindful of the slippery, rocky substrate in many areas. The combination of stunning scenery, the allure of catching native Cutthroat in a less crowded environment, and the diverse fishing opportunities make the Fall River a worthwhile destination for anglers seeking a more intimate and wild Idaho fishing experience.