San Mateo C below Lo Crystal Sp Reservoir near San Mateo CA

San Mateo County, California · USGS gauge 11162753 · NWS MEDC1 · San Mateo Creek flood status · California river levels

Is San Mateo C below Lo Crystal Sp Reservoir near San Mateo CA flooding right now?

San Mateo C below Lo Crystal Sp Reservoir near San Mateo CA measured 4.15 ft on 2026-10-27 17:30:00 UTC. No NWS minor flood stage is published for this gauge.

Gauge height

4.15 ft

as of 33 min ago

Streamflow

4 cfs

data refreshed 17 min ago

Streamflow outlook

NOAA National Water Model forecast, issued 12 hours ago. The NWM models discharge for every river reach in the country, including the many gauges the National Weather Service does not forecast individually. It is a model, not an official NWS river forecast, and it predicts flow rather than water level.

No National Weather Service flood stage is published for this gauge, so no flood category can be shown — why some gauges have no flood stage.

Nearby gauges

Gauge	Distance	County
Pilarcitos C below Stone Dam near Hillsborough CA	2.3 mi	San Mateo County
Pilarcitos C above Stone Dam near Hillsborough CA	2.3 mi	San Mateo County
Pilarcitos C below Spillway near Hillsborough CA	3.6 mi	San Mateo County
San Mateo C below Junction Box a Dam1 near Hillsborough	3.7 mi	San Mateo County
San Mateo C above Junction Box a Dam1 near Hillsborough	3.8 mi	San Mateo County

Provisional data: Real-time readings are provisional and subject to revision by the USGS — sensors can be affected by ice, debris, or equipment malfunction. Do not rely on this site for decisions involving personal safety; follow official guidance from the National Weather Service and local authorities.

Sources: USGS monitoring location · NWS gauge & forecast