San Mateo Creek below Lo Crystal Sp Reservoir near San Mateo
San Mateo Creek · Sierra / West · USGS gage 11162753
Coldwater (summer mean 15.4°C — prime coldwater).
Water
58°F
Flow
4 cfs
Air
57°F
Sky
88%
Pressure
29.87 in
Wind
6 mph
Predicted hatches · 2026-10-30
No bugs scoring above the noise floor right now.
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.