Colorado River Below Baker Gulch near Grand Lake
Colorado River · Rockies · USGS gage 09010500
Coldwater (summer mean 12.5°C — prime coldwater).
Water
57°F
Flow
12 cfs
Air
55°F
Sky
100%
Pressure
30.06 in
Wind
2 mph
Predicted hatches · 2026-09-17
PredictedSpotted / Summer CaddisHydropsyche spp.0.42
Predicted by conditions; no reports yet. water 13.7°C (57°F) is warming toward the prime band (14-19°C); shoulder of the season; 4 days sustained ≥12°C; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedMidgeChironomidae0.19
water 13.7°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.