Major Flood
25 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
21 ft
Minor Flood
17.7 ft
Action Stage
15 ft
What Floods at Each Level
25 ft
Major flood stage. Stage Road at San Gregorio Creek flooded and adjacent floodplain properties under 4 or more feet of water.
21 ft
Moderate flood stage. Adjacent floodplain under several feet of water. Stage Road crossing is backwatered.
17.7 ft
Minor flood stage. Flood waters inundate floodplain upstream of Stage Road crossing, mainly on left bank side (as looking downstream). NWS will issue a Flash Flood Warning if not yet already issued.
15 ft
Monitor stage. Water is 2.7 feet below adjacent floodplain properties. NWS may issue a Flash Flood Watch if not yet already issued.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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About This Gauge
USGS Site
NWS LID
SXGC1
River
San Gregorio Creek
County
San Mateo, CA
Coordinates
37.3258°N, 122.3866°W
Get Flood Alerts for San Gregorio Creek
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of San Gregorio Creek at San Gregorio?
The San Gregorio Creek at San Gregorio gauge is maintained by USGS (site 11162570) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for San Gregorio Creek at San Gregorio?
The NWS-defined flood stage for San Gregorio Creek at San Gregorio is 17.7 feet. Action stage begins at 15 feet. Moderate flooding starts at 21 feet, and major flooding at 25 feet.
How do I get alerts when San Gregorio Creek rises?
Download StormCast free on Google Play, go to River Gauges, and add San Gregorio Creek at San Gregorio to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the San Gregorio Creek at San Gregorio gauge located?
The gauge is located in San Mateo County, California at coordinates 37.3258°N, 122.3866°W. USGS site number: 11162570. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey