Big Beaver Creek Near Newhalem
Big Beaver Creek · Pacific NW · USGS gage 12172000
Coldwater (summer mean 10.6°C — prime coldwater).
Water
53°F
Flow
205 cfs
Air
72°F
Sky
1%
Pressure
30.00 in
Wind
1 mph
Predicted hatches · 2026-07-31
PredictedGreen DrakeDrunella spp.0.50
Predicted by conditions; no reports yet. water 11.7°C (53°F) sits in the prime band (11-15°C); shoulder of the season; 8 days sustained ≥10°C; watch midday, often cloudy.
flies: Green Drake Parachute #10-12, Cripple, Hares Ear #10
PredictedMidgeChironomidae0.36
Predicted by conditions; no reports yet. water 11.7°C (53°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.