Browse Idaho Fishing Reports

Covers Sep 30–Oct 7

Plan 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.

Covers Sep 23–30

The Big Lost is running low and clear with wary fish and good fall hatches of Tricos and Baetis through September 30.

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.

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.

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.

Covers Aug 26–Sep 2

Low, clear water through early September demands stealth but rewards mobile anglers with good midmorning dry-fly fishing in runs and edges. Plan your day around morning Tricos and Baetis, and expect slow afternoon action.

Covers Aug 19–26

Expect morning Trico and Baetis hatches on the main stem with temporary off-color water from the seasonal turnover; nymphing and subsurface tactics will produce once the hatch clears. Morning temperatures are chilly, so fishing improves as the day warms.

Covers Aug 12–19

Low flows make the Big Lost challenging but rewarding for anglers willing to fish small and precise. Morning Tricos give way to hoppers and selective mayfly patterns as the water warms.

Covers Aug 5–12

The Big Lost is dropping into low-flow summer conditions and fishing despite angler pressure. Expect hatch activity through the morning and afternoon, with both dry-fly and nymph opportunities. Move frequently to find fish that haven't seen multiple casts.

Covers Jul 29–Aug 5

The Big Lost's North Fork and main stem are in good shape heading into early August, with manageable flows and morning hatches of Tricos and PMDs. Plan to move around the East Fork's heavier pressure and pack attractors in multiple sizes.

Covers Jun 10–17

Expect high flows to keep the Big Lost challenging early in this outlook window. Water levels should trend downward as the week progresses, gradually opening up wading opportunities on the lower section. Scout the upper valley during high water; plan a return trip once flows recede.