TornadoLiveMap

San Lorenzo Creek (Alameda) above Hayward — water level right now

Alameda County, California · NWS gauge LRZC1
Loading the latest reading…
–
current stage (ft)
 
24.64
minor flood stage
 
–
flood status
official NWS category
Official NOAA forecast → USGS data → Full US flood map →

Flood stages at this gauge

Where the water stands right now against the four official thresholds:

action · 20.85
minor · 24.64
moderate · 29.64
major · 33
Flood stageLevel (ft)What it means
Major flood stage33extensive inundation and significant evacuations — a serious event
Moderate flood stage29.64some buildings and roads inundated; evacuations possible
Minor flood stage24.64low-lying roads and fields near the river start to flood
Action stage20.85water is approaching flood level — time to pay attention

Highest floods on record here

The National Weather Service has no historic crest list on file for this gauge.

Where this gauge is

The marker is this gauge; nearby gauges load live and are clickable.

Nearby river gauges

Crow Creek near Hayward 2 mi away · loading… San Lorenzo Creek (Alameda) at San Lorenzo 4 mi away · loading… Alamo Canal near Pleasanton 8 mi away · loading… Alameda Creek near Niles 9 mi away · loading… Arroyo de la Laguna at Verona 11 mi away · loading… Arroyo Las Positas above El Charro Rd 12 mi away · loading…

Gauge details

NWS gauge IDLRZC1
USGS site11181000
CountyAlameda
StateCalifornia
NWS forecast officeMonterey
River forecast centerCalifornia Nevada River Forecast Center
Coordinates37.685, -122.064
Time zonePST8PDT
Turn Around, Don't Drown. Six inches of moving water can knock you off your feet and twelve inches can float a car. Never drive around barricades or into water of unknown depth — most flood deaths happen in vehicles.

Questions about San Lorenzo Creek (Alameda) above Hayward

Is San Lorenzo Creek (Alameda) above Hayward flooding right now?

The live reading at the top of this page answers that: the gauge is compared against its official NWS flood stages every 15 minutes. Minor flooding at this gauge begins at 24.64 ft. Blue means normal, yellow is action stage, orange minor, red moderate and dark red major flooding.

What is flood stage for San Lorenzo Creek (Alameda) above Hayward?

major flood stage 33 ft, moderate flood stage 29.64 ft, minor flood stage 24.64 ft, action stage 20.85 ft. These are official National Weather Service thresholds set specifically for this gauge, not generic values.

Where does this data come from?

From the NOAA National Water Prediction Service, the official U.S. river gauge network — a U.S. government work in the public domain. Live stage is refreshed every 15 minutes; flood thresholds and historic crests are refreshed monthly. For life-safety decisions follow NWS Monterey and local emergency management.