M Fork Tumalo Creek above Prowell Springs, near Bend
M Fork Tumalo Creek · Pacific NW · USGS gage 14070615
Coldwater (summer mean 11.1°C — prime coldwater).
Water
33°F
Flow
0 cfs
Air
31°F
Sky
100%
Pressure
29.88 in
Wind
1 mph
Predicted hatches · 2026-10-30
PredictedMidgeChironomidae0.40
Predicted by conditions; no reports yet. water 0.8°C (33°F) is warming toward 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.