Major Flood
23 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
20 ft
Minor Flood
17 ft
Action Stage
15 ft
What Floods at Each Level
23 ft
Major Flood Stage. (Stage of 25.5 for co-located County ALERT stream gage.) Major flood inundation in town; travel along local roadways likely impossible and very dangerous. Major damage to local businesses and homes. Water is above guard rail on Lagunitas Road bridge.
20 ft
Moderate Flood Stage. (Stage of 22.5 for co-located County ALERT stream gage.) Lagunitas Road bridge is overtopped, and 1 to several feet of flood waters inundate local businesses, residences, and roadways.
17 ft
Minor Flood Stage. (Stage of 19.5 feet for co-located County ALERT stream gage.) Backwatering begins at Lagunitas Road bridge, with minor flooding near Town Hall and Fire Station. NWS will issue a Flash Flood Warning if not yet already issued.
15 ft
Monitor Stage. (Stage of 17.5 for co-located County ALERT stream gage.) Water level is 2 feet below Lagunitas Road bridge soffit, and less than 2 feet below local storm drain inlets on adjacent roads and parking lots. NWS will 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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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Dec 31, 2005 | 22.59 ft | — |
| Jan 3, 1982 | 19.81 ft | 7,200 cfs |
| Feb 16, 1986 | 18.07 ft | 4,150 cfs |
About This Gauge
USGS Site
NWS LID
CMDC1
River
Corte Madera Creek
County
Marin, CA
Coordinates
37.9630°N, 122.5569°W
Get Flood Alerts for Corte Madera 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 Corte Madera Creek at Ross?
The Corte Madera Creek at Ross gauge is maintained by USGS (site 11460000) 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 Corte Madera Creek at Ross?
The NWS-defined flood stage for Corte Madera Creek at Ross is 17 feet. Action stage begins at 15 feet. Moderate flooding starts at 20 feet, and major flooding at 23 feet.
How do I get alerts when Corte Madera Creek rises?
Download StormCast free on Google Play, go to River Gauges, and add Corte Madera Creek at Ross 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 Corte Madera Creek at Ross gauge located?
The gauge is located in Marin County, California at coordinates 37.9630°N, 122.5569°W. USGS site number: 11460000. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: USGS and County of Marin, Observations courtesy of U.S. Geological Survey