San Lorenzo C a San Lorenzo CA

Alameda County, California · USGS gauge 11181040 · NWS SLCC1 · California river levels

Is San Lorenzo C a San Lorenzo CA flooding right now?

San Lorenzo C a San Lorenzo CA measured 2.90 ft on 2026-10-27 19:30:00 UTC. No NWS minor flood stage is published for this gauge. Its action level is 12 ft; action level is not flood stage.

Gauge height

2.90 ft

as of 19 min ago

Streamflow

3 cfs

data refreshed 2 min ago

Streamflow outlook

NOAA National Water Model forecast, issued 14 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.

Flood stages at this gauge

Category	Stage	Current distance
Action	12 ft	9.1 ft below
Moderate flood	25.5 ft	22.6 ft below

New to these numbers? What does flood stage mean? · How to read a river gauge · Why is the river rising?

Nearby gauges

Gauge	Distance	County
Castro Valley C a Hayward CA	3.3 mi	Alameda County
San Lorenzo C a Hayward CA	4.1 mi	Alameda County
Cull C above Cull C Reservoir near Castro Valley CA	5.2 mi	Alameda County
San Lorenzo C above Don Castro Reservoir near Castro V CA	5.2 mi	Alameda County
Crow C near Hayward CA	5.4 mi	Alameda 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