Alameda Creek below Calaveras Creek near Sunol
Alameda Creek · Sierra / West · USGS gage 11173510
Coldwater (summer mean 15.6°C — prime coldwater).
Water
56°F
Flow
7 cfs
Air
57°F
Sky
2%
Pressure
30.11 in
Wind
4 mph
Predicted hatches · 2026-09-18
PredictedSpotted / Summer CaddisHydropsyche spp.0.38
Predicted by conditions; no reports yet. water 13.5°C (56°F) is warming toward the prime band (14-19°C); shoulder of the season; 8 days sustained ≥12°C; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedMidgeChironomidae0.21
water 13.5°C (56°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.