Green River Below Fontenelle Reservoir
Green River · Rockies · USGS gage 09211200
Trout (marginal) (summer mean 18.2°C — trout, warm in summer).
Water
53°F
Flow
708 cfs
Air
34°F
Sky
47%
Pressure
29.91 in
Wind
5 mph
Predicted hatches · 2026-10-30
PredictedBlue-Winged OliveBaetis spp.0.77
Predicted by conditions; no reports yet. water 11.7°C (53°F) is cooling past the prime band (6-11°C); peak season; 8 days sustained ≥4°C; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PredictedMidgeChironomidae0.36
Predicted by conditions; no reports yet. water 11.7°C (53°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.