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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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Gallinas Creek Near Montezuma

Gallinas Creek · Rockies · USGS gage 08380500

Trout (marginal) (summer mean 18.3°C — trout, warm in summer).

Water
77°F
Flow
4 cfs
Air
85°F
Sky
15%
Pressure
29.56 in
Wind
9 mph
Predicted hatches · 2026-08-03
PredictedHopper / TerrestrialsAcrididae (grasshoppers)1.00
Predicted by conditions; no reports yet. water 25.2°C (77°F) is cooling past the prime band (17-24°C); peak season; 8 days sustained ≥14°C; warm sun favors it; low pressure — fish looking up; wind puts terrestrials in play; watch warm, breezy afternoons.
flies: Morrish Hopper #8-12, Chubby Chernobyl, Dave's Hopper

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