Sf Boise River At Anderson Ranch Dam
Sf Boise River · Rockies · USGS gage 13190500
Coldwater (summer mean 9.7°C — prime coldwater).
Water
44°F
Flow
1,600 cfs
Air
83°F
Sky
59%
Predicted hatches · 2026-06-16
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 6.9°C (44°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.