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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 Sugar Crk near Stibnite

Efsf Salmon River · Rockies · USGS gage 13311250

Coldwater (summer mean 12.0°C — prime coldwater).

Water
46°F
Flow
90 cfs
Air
68°F
Sky
0%
Pressure
29.84 in
Wind
2 mph
Predicted hatches · 2026-07-30
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 8.0°C (46°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.