Kootenai River At Leonia
Kootenai River · Rockies · USGS gage 12305000
Coldwater (summer mean 15.4°C — prime coldwater; very large river (22,100 cfs)).
Water
51°F
Flow
4,520 cfs
Air
40°F
Sky
50%
Pressure
30.05 in
Wind
3 mph
Predicted hatches · 2026-10-30
PredictedBlue-Winged OliveBaetis spp.1.00
Predicted by conditions; no reports yet. water 10.7°C (51°F) sits in 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
PredictedMidgeChironomidae0.44
Predicted by conditions; no reports yet. water 10.7°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.