Willow Creek Near Harrison
Willow Creek · Rockies · USGS gage 06035000
Trout (marginal) (summer mean 16.6°C — trout, warm in summer).
Water
39°F
Flow
19 cfs
Air
31°F
Sky
44%
Pressure
29.96 in
Wind
0 mph
Predicted hatches · 2026-10-30
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 3.7°C (39°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.