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Hatch predictions for 300+ US rivers — built from live water & weather, then confirmed against real fly-shop reports.

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American River at Fair Oaks

American River · Sierra / West · USGS gage 11446500

Trout (marginal) (summer mean 18.0°C — trout, warm in summer).

Water
58°F
Flow
1,210 cfs
Air
57°F
Sky
100%
Pressure
29.87 in
Wind
2 mph
Predicted hatches · 2026-10-30

No bugs scoring above the noise floor right now.

PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.