near Fork Flathead River near Columbia Falls
near Fork Flathead River · Rockies · USGS gage 12355500
Coldwater (summer mean 15.0°C — prime coldwater; very large river (6,450 cfs)).
Water
51°F
Flow
6,370 cfs
Air
72°F
Sky
100%
Predicted hatches · 2026-06-15
PredictedGreen DrakeDrunella spp.0.69
Predicted by conditions; no reports yet. water 10.8°C (51°F) is warming toward the prime band (11-15°C); peak season; 2 days sustained ≥10°C (wants 3); watch midday, often cloudy.
flies: Green Drake Parachute #10-12, Cripple, Hares Ear #10
PredictedMidgeChironomidae0.43
Predicted by conditions; no reports yet. water 10.8°C (51°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.