Glenbrook Creek At Glenbrook
Glenbrook Creek · Sierra / West · USGS gage 10336730
Coldwater (summer mean 12.1°C — prime coldwater; very low flow (0.3 cfs) — small/seasonal).
Water
50°F
Flow
0 cfs
Air
54°F
Sky
31%
Pressure
29.81 in
Wind
14 mph
Predicted hatches · 2026-09-15
PredictedBlue-Winged OliveBaetis spp.0.50
Predicted by conditions; no reports yet. water 9.8°C (50°F) sits in the prime band (6-11°C); shoulder of the season; 8 days sustained ≥4°C; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 9.8°C (50°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.