Au Sable River Near Red Oak
Au Sable River · Driftless / Midwest · USGS gage 04136000
Trout (marginal) (summer mean 18.7°C — trout, warm in summer).
Water
51°F
Flow
832 cfs
Air
42°F
Sky
19%
Pressure
30.25 in
Wind
5 mph
Predicted hatches · 2026-10-30
PredictedBlue-Winged OliveBaetis spp.0.96
Predicted by conditions; no reports yet. water 10.3°C (51°F) sits in 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
PredictedMidgeChironomidae0.46
Predicted by conditions; no reports yet. water 10.3°C (51°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.