Kootenai River At Porthill
Kootenai River · Rockies · USGS gage 12322000
Trout (marginal) (summer mean 17.1°C — trout, warm in summer; very large river (21,700 cfs)).
Water
49°F
Flow
7,970 cfs
Air
36°F
Sky
4%
Pressure
30.13 in
Wind
2 mph
Predicted hatches · 2026-11-02
PredictedBlue-Winged OliveBaetis spp.0.48
Predicted by conditions; no reports yet. water 9.5°C (49°F) sits in the prime band (6-11°C); shoulder of the 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 9.5°C (49°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.