Mf San Joaquin River near Mammoth Lakes
Mf San Joaquin River · Sierra / West · USGS gage 11224000
Coldwater (summer mean 13.7°C — prime coldwater).
Water
39°F
Flow
6 cfs
Air
33°F
Sky
10%
Pressure
29.91 in
Wind
10 mph
Predicted hatches · 2026-10-30
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 3.9°C (39°F) sits in 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.