Fly Fish ForecastBeta

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

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New Fork River Near Big Piney

New Fork River · Rockies · USGS gage 09205000

Trout (marginal) (summer mean 18.0°C — trout, warm in summer).

Water
46°F
Flow
985 cfs
Air
74°F
Sky
8%
Predicted hatches · 2026-06-16
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 7.5°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.