Kootenai River below Libby Dam near Libby
Kootenai River · Rockies · USGS gage 12301933
Coldwater (summer mean 14.6°C — prime coldwater; very large river (20,000 cfs)).
Water
39°F
Flow
20,100 cfs
Air
85°F
Sky
100%
Predicted hatches · 2026-06-16
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 4.0°C (39°F) sits in the prime band (1-10°C); shoulder of the season; 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.