The South Fork of the Snake River is widely regarded as one of the premier cutthroat trout fisheries in North America, and the numbers back up that claim. Stretching 63 miles from Palisades Dam on the Wyoming-Idaho border to its confluence with the main Snake near Menan, the South Fork produces Yellowstone cutthroat trout in remarkable density — surveys have documented 3,000 to 5,000 catchable fish per mile in prime sections, numbers that rival the best tailwater fisheries in the country. Add in brown trout pushing 24 inches and a season that runs from salmonfly to October BWOs, and you have a world-class river sitting quietly in the shadow of its more famous neighbor, Henry's Fork.
The tailwater character of the South Fork — created by Palisades Dam releasing cold water from the depths of Palisades Reservoir — moderates temperature extremes and creates ideal trout holding conditions year-round. Yellowstone cutthroat averaging 14 to 18 inches are the stars of the show, and they are renowned for their eagerness to eat dry flies. These fish did not earn a reputation as suckers — they are selective when the hatch is on — but their willingness to look up makes the South Fork a dream dry fly river.
Float fishing dominates on the South Fork, and for good reason. The 63-mile corridor provides multiple half-day and full-day float options, with experienced guides running drift boats through the best holding water. The braided channels, island complexes, and cottonwood groves that characterize the canyon sections create remarkable habitat diversity. Boat ramps at Palisades, Byington, Conant Valley, and Lorenzo provide options for half-day or full-day floats.
The South Fork's hatches are the stuff of legend. The salmonfly hatch in late May and early June is one of the most spectacular events in Western fly fishing — three to four-inch stoneflies carpeting the willows, large cutthroat and browns crashing the surface. Follow the hatch upstream from Lorenzo toward Palisades Dam for 10 to 14 days of world-class dry fly fishing. PMD hatches in July and August sustain the action, while August and September hopper fishing produces aggressive strikes in the braided side channels. October BWOs complete the season with hatches that can produce fish rising bank to bank.
The South Fork runs through the Caribou-Targhee National Forest in its upper section, with Bureau of Land Management lands in the lower canyon. The small community of Swan Valley serves as the primary service hub, with several fly shops and guide services catering to South Fork anglers.
