Blue River Below Dillon, Co.
Blue River · Rockies · USGS gage 09050700
Coldwater (summer mean 8.4°C — prime coldwater).
Water
42°F
Flow
56 cfs
Air
62°F
Sky
0%
Pressure
29.89 in
Wind
5 mph
Predicted hatches · 2026-07-31
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 5.8°C (42°F) sits in 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.