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
41°F
Flow
737 cfs
Air
38°F
Sky
0%
Pressure
30.12 in
Wind
6 mph
Predicted hatches · 2026-10-30
PredictedBlue-Winged OliveBaetis spp.0.58
Predicted by conditions; no reports yet. water 5.2°C (41°F) is warming toward the prime band (6-11°C); peak season; 8 days sustained ≥4°C; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PredictedMidgeChironomidae0.48
Predicted by conditions; no reports yet. water 5.2°C (41°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.