Gros Ventre River At Kelly
Gros Ventre River · Rockies · USGS gage 13014500
Coldwater (summer mean 15.8°C — prime coldwater).
Water
54°F
Flow
1,110 cfs
Air
62°F
Sky
37%
Pressure
29.60 in
Wind
5 mph
Predicted hatches · 2026-06-20
PredictedGreen DrakeDrunella spp.1.00
Predicted by conditions; no reports yet. water 12.1°C (54°F) sits in the prime band (11-15°C); peak season; 8 days sustained ≥10°C; low pressure — fish looking up; watch midday, often cloudy.
flies: Green Drake Parachute #10-12, Cripple, Hares Ear #10
PredictedMidgeChironomidae0.36
Predicted by conditions; no reports yet. water 12.1°C (54°F) is cooling past the prime band (1-10°C); shoulder of the season; 8 days sustained ≥0°C; low pressure — fish looking up; 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.