Snake River near Irwin
Snake River · Rockies · USGS gage 13032500
Coldwater (summer mean 15.8°C — prime coldwater; very large river (11,100 cfs)).
Water
49°F
Flow
10,600 cfs
Air
76°F
Sky
0%
Pressure
29.84 in
Wind
10 mph
Predicted hatches · 2026-07-31
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 9.4°C (49°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.