Colgan Creek near Sebastopol
California — Water Level & Flood Stage
Located in Sonoma County, California on the Colgan Creek. Live water level data from USGS gauge 11465700, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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Flood Stages
Major Flood
79 ft
Moderate Flood
76.5 ft
Minor Flood
75 ft
Action Stage
73.5 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
79 ft
Major Flooding. Major floodplain inundation and water levels at approximately 1 foot above elevation of bridge deck on Llano Road.
76.5 ft
Moderate Flooding. Additional floodplain and roadway inundation on Llano Road. NWS will issue a Flash Flood Warning, if not yet already issued.
75 ft
Minor Flooding. Floodplain upstream of the Llano Road bridge on right bank (north) side begins to flood into adjacent farmland. NWS will issue an Urban/Small Stream Advisory, if not yet already issued.
73.5 ft
Monitor Stage. Roadside ditch upstream of Llano Road bridge on the left bank (south) side begins to flood. 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
Get Flood Alerts for Colgan 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 Colgan Creek near Sebastopol?
The Colgan Creek near Sebastopol gauge is maintained by USGS (site 11465700) 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 Colgan Creek near Sebastopol?
The NWS-defined flood stage for Colgan Creek near Sebastopol is 75 feet. Action stage begins at 73.5 feet. Moderate flooding starts at 76.5 feet, and major flooding at 79 feet.
How do I get alerts when Colgan Creek rises?
Download StormCast free on Google Play, go to River Gauges, and add Colgan Creek near Sebastopol to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Colgan Creek near Sebastopol gauge located?
The gauge is located in Sonoma County, California at coordinates 38.3735°N, 122.7683°W. USGS site number: 11465700. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Colgan Creek
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey