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
52°F
Flow
21 cfs
Air
67°F
Sky
0%
Pressure
29.98 in
Wind
7 mph
Predicted hatches · 2026-09-17
PredictedBlue-Winged OliveBaetis spp.0.47
Predicted by conditions; no reports yet. water 11.2°C (52°F) is cooling past 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
PredictedMidgeChironomidae0.40
Predicted by conditions; no reports yet. water 11.2°C (52°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.