Colorado River Below Baker Gulch near Grand Lake
Colorado River · Rockies · USGS gage 09010500
Coldwater (summer mean 12.5°C — prime coldwater).
Water
52°F
Flow
67 cfs
Air
50°F
Sky
0%
Pressure
29.75 in
Wind
1 mph
Predicted hatches · 2026-06-18
PredictedGreen DrakeDrunella spp.0.90
Predicted by conditions; no reports yet. water 10.9°C (52°F) is warming toward the prime band (11-15°C); peak season; 6 days sustained ≥10°C; watch midday, often cloudy.
flies: Green Drake Parachute #10-12, Cripple, Hares Ear #10
PredictedMidgeChironomidae0.42
Predicted by conditions; no reports yet. water 10.9°C (52°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.