Major Flood
37.3 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
32 ft
Minor Flood
29 ft
Action Stage
24.5 ft
What Floods at Each Level
37.29 ft
Stages above 37.3 feet results in flooding outside the levees. Top of levee.
29.6 ft
Homes along east bank of river on Airport Court in Manteca experience flooding.
26 ft
Severe seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises.
24.5 ft
Monitor Stage - water reaches the toe of levee.
21 ft
Seepage begins into crop area outside of levees.
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 4, 1997 | 34.88 ft | 75,600 cfs |
| Jan 26, 1969 | 34.55 ft | — |
| Dec 8, 1950 | 32.81 ft | 79,000 cfs |
About This Gauge
USGS Site
NWS LID
VNSC1
River
San Joaquin River
County
San Joaquin, CA
Coordinates
37.6760°N, 121.2663°W
Get Flood Alerts for San Joaquin 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 San Joaquin River at Vernalis?
The San Joaquin River at Vernalis gauge is maintained by USGS (site 11303500) 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 Joaquin River at Vernalis?
The NWS-defined flood stage for San Joaquin River at Vernalis is 29 feet. Action stage begins at 24.5 feet. Moderate flooding starts at 32 feet, and major flooding at 37.3 feet.
How do I get alerts when San Joaquin River rises?
Download StormCast free on Google Play, go to River Gauges, and add San Joaquin River at Vernalis 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 Joaquin River at Vernalis gauge located?
The gauge is located in San Joaquin County, California at coordinates 37.6760°N, 121.2663°W. USGS site number: 11303500. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: Observations courtesy of U.S. Geological Survey, Observations Courtesy of CA Department of Water Resources