Tuolumne River above Early Intake near Mather
Tuolumne River · Sierra / West · USGS gage 11276600
Trout (marginal) (summer mean 19.4°C — trout, warm in summer).
Water
53°F
Flow
47 cfs
Air
54°F
Sky
100%
Pressure
29.91 in
Wind
3 mph
Predicted hatches · 2026-10-30
PredictedBlue-Winged OliveBaetis spp.0.88
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; overcast skies favor it; 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.