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Hatch predictions for 300+ US rivers — built from live water & weather, then confirmed against real fly-shop reports.

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Efsf Salmon River above Meadow Crk near Stibnite

Efsf Salmon River · Rockies · USGS gage 13310800

Coldwater (summer mean 8.6°C — prime coldwater).

Water
42°F
Flow
21 cfs
Air
66°F
Sky
1%
Pressure
29.88 in
Wind
3 mph
Predicted hatches · 2026-07-31
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 5.3°C (42°F) sits in the prime band (1-10°C); shoulder of the season; watch midday, especially cold months.
flies: Zebra Midge #18-22, Griffith's Gnat, Disco Midge

PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.