Flat Creek Below Cache Creek, Near Jackson
Flat Creek · Rockies · USGS gage 13018350
Trout (marginal) (summer mean 17.0°C — trout, warm in summer).
Water
55°F
Flow
39 cfs
Air
42°F
Sky
0%
Pressure
30.05 in
Wind
6 mph
Predicted hatches · 2026-09-15
PredictedMidgeChironomidae0.28
water 12.6°C (55°F) is cooling past the prime band (1-10°C); shoulder of the season; 7 days sustained ≥0°C; watch midday, especially cold months.
flies: Zebra Midge #18-22, Griffith's Gnat, Disco Midge
PredictedBlue-Winged OliveBaetis spp.0.23
water 12.6°C (55°F) is cooling past the prime band (6-11°C); shoulder of the season; 7 days sustained ≥4°C; 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.