Major Flood
16.29 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
13.78 ft
Minor Flood
12.5 ft
Action Stage
10.85 ft
What Floods at Each Level
16.29 ft
Major flood, 37,000 cfs. Widespread inundation of Camp Pendleton with evacuations likely. Flood of Record Jan 16, 1993.
13.78 ft
Moderate flood stage, 17,000 cfs. Vandegrift Road is flooded for several miles downstream of the gage site. Stuart Mesa Road is flooded near the bridge.
12.5 ft
Minor flood stage, 8,000 cfs. Vandegrift Road has begun to flood downstream of the gage. Stuart Mesa Road closures can be expected.
10.85 ft
2,500 cfs. The river has reached monitor stage. Personnel begin regular patrols along the levee.
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 |
|---|---|---|
| Jan 15, 1993 | 20.47 ft | 44,000 cfs |
| Feb 17, 1980 | 18.8 ft | 24,000 cfs |
| Feb 28, 1978 | 18.12 ft | 21,200 cfs |
About This Gauge
USGS Site
NWS LID
YDRC1
River
Santa Margarita River
County
San Diego, CA
Coordinates
33.3111°N, 117.3473°W
Get Flood Alerts for Santa Margarita River
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 Santa Margarita River at Ysidora?
The Santa Margarita River at Ysidora gauge is maintained by USGS (site 11046000) 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 Santa Margarita River at Ysidora?
The NWS-defined flood stage for Santa Margarita River at Ysidora is 12.5 feet. Action stage begins at 10.85 feet. Moderate flooding starts at 13.78 feet, and major flooding at 16.29 feet.
How do I get alerts when Santa Margarita River rises?
Download StormCast free on Google Play, go to River Gauges, and add Santa Margarita River at Ysidora 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 Santa Margarita River at Ysidora gauge located?
The gauge is located in San Diego County, California at coordinates 33.3111°N, 117.3473°W. USGS site number: 11046000. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
Upstream: Santa Margarita River near Temecula
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey