Bull Run River below Bull Run Reservoir 2, near Bull Run
Bull Run River · Pacific NW · USGS gage 14139940
Coldwater (summer mean 13.5°C — prime coldwater).
Water
56°F
Flow
36 cfs
Air
44°F
Sky
0%
Pressure
29.96 in
Wind
7 mph
Predicted hatches · 2026-11-01
PredictedMidgeChironomidae0.22
water 13.4°C (56°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.