Browse Idaho Fishing Reports

Flows are low and falling into the off-season range, but clear water and midday olive hatches offer solid midday dry-fly opportunity.

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

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.

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.

Covers Sep 16–23

Low water is concentrating Big Lost River trout into prime holding zones where fall Baetis and caddis patterns should produce once fish settle in.

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.

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.

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

Covers Sep 9–16

Low water defines the Big Lost this week, from stealth-demanding headwaters to wadeable but pushy flows below Mackay. Morning Tricos and Baetis give way to crane flies and quiet afternoons; small nymphs and midges work when surface activity slows.

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.

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.

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.

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.

Covers Sep 2–9

Expect low, clear water with Tricos and Baetis dominating the hatch. Best fishing runs from midday into late afternoon when temperatures rise enough to concentrate fish and trigger consistent bug activity.

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.