Rex River Near Cedar Falls
Rex River · Pacific NW · USGS gage 12115500
Coldwater (summer mean 13.1°C — prime coldwater).
Water
51°F
Flow
8 cfs
Air
49°F
Sky
100%
Pressure
30.03 in
Wind
1 mph
Predicted hatches · 2026-09-15
PredictedBlue-Winged OliveBaetis spp.0.57
Predicted by conditions; no reports yet. water 10.5°C (51°F) sits in the prime band (6-11°C); shoulder of the season; 8 days sustained ≥4°C; overcast skies favor it; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PredictedMidgeChironomidae0.46
Predicted by conditions; no reports yet. water 10.5°C (51°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.