Bull Run River At Lower Flume near Brightwood
Bull Run River · Pacific NW · USGS gage 14138720
Coldwater (summer mean 6.0°C — prime coldwater).
Water
44°F
Flow
19 cfs
Air
59°F
Sky
0%
Pressure
29.98 in
Wind
4 mph
Predicted hatches · 2026-07-31
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 6.5°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.