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Upper Snake / Eastern Idaho

Idaho’s most famous trout rivers, from the Ranch to the South Fork.

Eastern Idaho contains some of the best-known trout water in the West, along with smaller rivers that receive far less attention. Track flows, hatches, reports, and access across the Henrys Fork, South Fork Snake, Teton, Fall, Warm, Big Lost, and Little Lost rivers.

Rivers

7

Recent reports

95

Last updated

October 15, 2026

Rivers

Lakes

Latest by river

DateRiverConditions
October 15, 2026South Fork Snake RiverFlows are dropping into comfortable mid-October levels with clear water and pleasant weather. Midday hatches of Mahogany Duns and Blue Winged Olives should draw trout between 10 a.m. and 2 p.m.
October 11, 2026Henrys Fork of the Snake River, Box Canyon to RiversideFlows at 159 cfs are extremely low, but streamer fishing is solid and fall hatches are active with rising fish.
October 5, 2026Henrys Fork of the Snake RiverGin-clear water and low flows make the Henrys Fork challenging, with heavy Blue-Winged Olive hatches and an incoming storm system expected to bring heavier Baetis emergence and temporary discoloration.
October 3, 2026Teton RiverThe Teton offers prime dry-fly fishing in early October with stable flows of 401 CFS and clear skies. Mahogany duns, Blue Wing Olives, and small hoppers are the go-to patterns.
Covers Sep 30–Oct 7Big Lost RiverPlan to fish the Big Lost in the afternoons next week when water warms. Flows are dropping across the system, creating good opportunities in shallow seams and deeper runs.
September 19, 2026Snake River, Osgood Diversion Dam to Henrys ForkClear water and excellent visibility are bringing strong terrestrial action along structure. Focus cut banks and willow edges as fish move off mid-river bars.
August 30, 2026Henrys Fork of the Snake River, Riverside to Mouth / terminusThe lower Henrys Fork is in good shape with stable late-summer flows and fall conditions favoring streamers and nymphs.