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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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Colorado River Below Baker Gulch near Grand Lake

Colorado River · Rockies · USGS gage 09010500

Coldwater (summer mean 12.5°C — prime coldwater).

Water
n/a
Flow
12 cfs
Air
35°F
Sky
27%
Pressure
29.97 in
Wind
3 mph
Predicted hatches · 2026-11-01

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.