Alameda Creek below Welch Creek near Sunol
Alameda Creek · Sierra / West · USGS gage 11173575
Trout (marginal) (summer mean 18.9°C — trout, warm in summer).
Water
57°F
Flow
9 cfs
Air
59°F
Sky
96%
Pressure
29.87 in
Wind
2 mph
Predicted hatches · 2026-10-30
PredictedMidgeChironomidae0.18
water 13.8°C (57°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.