Major Flood
33.1 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: MOSC1). Live data may be limited. View on NWS AHPS →
FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
32.1 ft
Minor Flood
28.5 ft
Action Stage
19.5 ft
What Floods at Each Level
33.1 ft
Stages above 33.1 feet result in flooding outside of the levees. Top of levee.
16.39 ft
Historically Mossdale Trailer Park evacuates.
15.4 ft
Mossdale Trailer Park is threatened by the high water. Mossdale Trailer Park is on the south side of the river inside the levee both upstream and downstream of the gage.
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 9, 1950 | 24.4 ft | — |
| Jan 9, 1997 | 23.24 ft | — |
| Feb 23, 2017 | 21.7 ft | — |
About This Gauge
NWS LID
MOSC1
River
San Joaquin River
County
San Joaquin, CA
Coordinates
37.7861°N, 121.3061°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 Mossdale Bridge?
The San Joaquin River at Mossdale Bridge gauge is maintained by USGS 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 Mossdale Bridge?
The NWS-defined flood stage for San Joaquin River at Mossdale Bridge is 28.5 feet. Action stage begins at 19.5 feet. Moderate flooding starts at 32.1 feet, and major flooding at 33.1 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 Mossdale Bridge 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 Mossdale Bridge gauge located?
The gauge is located in San Joaquin County, California at coordinates 37.7861°N, 121.3061°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on San Joaquin River
On This River
Upstream: San Joaquin River at Vernalis
More Resources
Source & Notes
Data provided by: Observations Courtesy of CA Department of Water Resources
- Crests prior to 10/1/2006 are in an old datum. Datum change to NAVD88 occurred 10/1/2006.<a href="http://cdec.water.ca.gov/misc/datum_change2006.html"> See LINK for correction value.</a>