M Fork Tumalo Creek below Prowell Springs, near Bend
M Fork Tumalo Creek · Pacific NW · USGS gage 14070624
Coldwater (summer mean 7.5°C — prime coldwater).
Water
39°F
Flow
6 cfs
Air
40°F
Sky
92%
Pressure
30.01 in
Wind
9 mph
Predicted hatches · 2026-09-16
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 3.7°C (39°F) sits in the prime band (1-10°C); shoulder of the season; 7 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.