Tuolumne River near Hetch Hetchy
Tuolumne River · Sierra / West · USGS gage 11276500
Coldwater (summer mean 12.3°C — prime coldwater).
Water
51°F
Flow
85 cfs
Air
62°F
Sky
0%
Pressure
29.76 in
Wind
4 mph
Predicted hatches · 2026-09-15
PredictedBlue-Winged OliveBaetis spp.0.50
Predicted by conditions; no reports yet. water 10.4°C (51°F) sits in the prime band (6-11°C); shoulder of the season; 8 days sustained ≥4°C; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PredictedMidgeChironomidae0.47
Predicted by conditions; no reports yet. water 10.4°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.