Gallatin River Above Deer Creek, Near Big Sky
Gallatin River · Rockies · USGS gage 06043120
Coldwater (summer mean 14.1°C — prime coldwater).
Water
54°F
Flow
314 cfs
Air
45°F
Sky
0%
Pressure
30.02 in
Wind
3 mph
Predicted hatches · 2026-08-04
PredictedMidgeChironomidae0.33
water 12.0°C (54°F) is cooling past the prime band (1-10°C); shoulder of the season; 8 days sustained ≥0°C; 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.