Gros Ventre River At Kelly
Gros Ventre River · Rockies · USGS gage 13014500
Coldwater (summer mean 15.8°C — prime coldwater).
Water
56°F
Flow
227 cfs
Air
55°F
Sky
100%
Pressure
30.04 in
Wind
8 mph
Predicted hatches · 2026-09-18
PredictedSpotted / Summer CaddisHydropsyche spp.0.30
water 13.2°C (56°F) is warming toward the prime band (14-19°C); shoulder of the season; 8 days sustained ≥12°C; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedMidgeChironomidae0.23
water 13.2°C (56°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
PredictedBlue-Winged OliveBaetis spp.0.15
water 13.2°C (56°F) is cooling past the prime band (6-11°C); shoulder of the season; 8 days sustained ≥4°C; overcast skies favor it; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.