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© 2026 Barbless.co. Flow and gauge data from USGS; weather from Open-Meteo. · v2026.10.18.2

  1. Reports
  2. Browse
Oct2026October 2026
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Region

  • All regions
  • North-Central Idaho85
  • Panhandle94
  • Salmon Region10
  • South Central Idaho35
  • Southwest Idaho9
  • Upper Snake / Eastern Idaho85

Rivers & Lakes

  • All waters
  • Big Lost River1
  • Henrys Fork of the Snake River9
  • Henrys Fork of the Snake River, Box Canyon to Riverside13
  • Henrys Fork of the Snake River, Riverside to Mouth / terminus7
  • Henrys Lake6
  • Island Park Reservoir1
  • Mackay Reservoir1
  • Snake River, Osgood Diversion Dam to Henrys Fork1
  • South Fork Snake River36
  • Teton River10

Report Type

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  • Conditions85
  • Outlook11

Browse Idaho Fishing Reports

Current conditions, flows, and hatch notes for Idaho rivers: updated as new reports are published.

Updated October 19, 2026

Filters:Upper Snake / Eastern IdahoRemove Upper Snake / Eastern Idaho filterConditionsRemove Conditions filterClear all

Showing 21–40 of 85 reports

Filters:Upper Snake / Eastern IdahoRemove Upper Snake / Eastern Idaho filterConditionsRemove Conditions filterClear all

September 20, 2026

Upper Snake / Eastern Idaho

Teton River

The Teton flows near normal with clear water and active fall hatches including caddis, olives, and stoneflies.

497 cfs ↑

September 19, 2026

Upper Snake / Eastern Idaho

Henrys Fork of the Snake River, Box Canyon to Riverside

Henrys Fork is dropping into fall with volatile flows settling lower. Mahogany Duns and Blue-Winged Olives are on, with recent weed clearing making the water easier to fish.

Upper Snake / Eastern Idaho

Henrys Lake

Cooler fall temperatures are firing up fishing on Henrys Lake, but lower water levels complicate boat access.

Upper Snake / Eastern Idaho

Snake River, Osgood Diversion Dam to Henrys Fork

Clear water and excellent visibility are bringing strong terrestrial action along structure. Focus cut banks and willow edges as fish move off mid-river bars.

Upper Snake / Eastern Idaho

South Fork Snake River

Flows are dropping fast on the South Fork, exposing gravel bars and favoring waders. Mahogany Duns and Blue-Winged Olives are on the water.

Very low · 2,150 cfs

Upper Snake / Eastern Idaho

Teton River

The Teton is fishing well with grasshoppers, ants, and Grey Drakes all active. Focus on dry-fly presentations during peak emergence periods for the best shot at larger fish.

September 17, 2026

Upper Snake / Eastern Idaho

South Fork Snake River

Fall conditions with cooler temperatures are establishing themselves on the South Fork, with slightly turbid upper water favoring streamers and clearer lower sections ideal for dun imitations.

Very low · 2,160 cfs

September 15, 2026

Upper Snake / Eastern Idaho

South Fork Snake River

The South Fork is running very low and falling, with good mahogany and BWO activity on overcast days. Fish nymphs and terrestrials early and during cloud cover.

Very low · 2,560 cfs

September 12, 2026

Upper Snake / Eastern Idaho

Henry's Fork of the Snake River, Box Canyon to Riverside

Clear water and steady flows at 1,140 cfs favor sight-casting through the morning hatch, with Mahogany Duns and Blue-Winged Olives peaking midday before afternoon winds build.

1,140 cfs

September 10, 2026

Upper Snake / Eastern Idaho

South Fork Snake River

Selective fishing between seasons on the South Fork with Blue Winged Olives, Mahogany mayflies, and terrestrials on the menu.

3,810 cfs

September 8, 2026

Upper Snake / Eastern Idaho

South Fork Snake River

Water temperature is 65°F with flows dropping steadily as Palisades Reservoir draws down. Overcast skies favor dry fly fishing with Mahoganies, Blue-winged Olives, hoppers, and terrestrials on the menu.

3,840 cfs

September 6, 2026

Upper Snake / Eastern Idaho

South Fork Snake River

Clear water and mostly clear skies offer classic September conditions on the South Fork, though gusty winds will taper the afternoon dry-fly window. Flows are trending ideal for fall, with grasshoppers, ants, and stoneflies all on the menu.

3,590 cfs ↓

September 5, 2026

Upper Snake / Eastern Idaho

Henrys Fork of the Snake River

Clear water below Mesa Falls and higher-than-normal flows pushing trout to seams make the lower Henrys Fork productive through Saturday morning, with solid Baetis, Caddis, and Midge activity.

1,790 cfs ↑

September 3, 2026

Upper Snake / Eastern Idaho

South Fork Snake River

Fall-like conditions with cooled temperatures and dropping flows are creating a sweet spot on the South Fork. Early morning dries, afternoon nymphs, hoppers, and streamers are all producing.

3,610 cfs ↓

September 1, 2026

Upper Snake / Eastern Idaho

South Fork Snake River

Late summer has the South Fork dropping fast, with flows at 3,590 cfs and water temperature holding at 65°F. Mutant stones, Mahoganies, and Blue-winged Olives are hatching, with hoppers effective in afternoons.

4,080 cfs ↓

August 30, 2026

Upper Snake / Eastern Idaho

Henrys Fork of the Snake River, Box Canyon to Riverside

Cool water from Island Park Reservoir and moderate flows favor eager fish. Mahogany duns are hatching and big rainbows are on the move.

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Upper Snake / Eastern Idaho

South Fork Snake River

Dropping flows and clear skies are pushing trout to banks and seams. Match the afternoon terrestrial pulse and morning stonefly work, and fish early before gusty winds pick up.

Upper Snake / Eastern Idaho

Henrys Fork of the Snake River, Riverside to Mouth

The lower Henrys Fork is in good shape with stable late-summer flows and fall conditions favoring streamers and nymphs.

1,350 cfs

Upper Snake / Eastern Idaho

Henrys Lake

Fish are moving shallower and feeding better. Try snow cones, balanced leeches, and cocktail nymphs.

Upper Snake / Eastern Idaho

South Fork Snake River

Cooling weather is bringing excellent fishing with small dries, nymphs, and streamers all producing. Mahogany duns and BWOs are on the water.

6,260 cfs