Tomorrow River Near Nelsonville
Tomorrow River · Driftless / Midwest · USGS gage 04080798
Coldwater (summer mean 15.4°C — prime coldwater).
Water
51°F
Flow
28 cfs
Air
46°F
Sky
0%
Pressure
30.21 in
Wind
8 mph
Predicted hatches · 2026-10-30
PredictedBlue-Winged OliveBaetis spp.0.96
Predicted by conditions; no reports yet. water 10.8°C (51°F) sits in the prime band (6-11°C); peak season; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PredictedMidgeChironomidae0.42
Predicted by conditions; no reports yet. water 10.8°C (51°F) is cooling past the prime band (1-10°C); shoulder of the season; 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.