National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SAN JOAQUIN RIVER - VERNALIS (VNSC1)
Latitude: 37.68º NLongitude: 121.27º WElevation: 35 Feet
Location: San Joaquin County in CaliforniaRiver Group: San Joaquin
Monitor Stage: 24.5 FeetFlood Stage: 29.0 FeetDanger Stage: 29.5 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View USGS Data for this station location.

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2024*
10,300
18.12
Mar 6, 2024
2023*
34,400
29.82
Mar 19, 2023
2022*
2,600
10.83
Dec 29, 2021
2021*
2,470
10.76
Jan 31, 2021
2020*
6,130
14.29
Dec 9, 2019
 Historical High Stage/Flow Events (Period of Record - Jul 1922 to Present) - Ranked by Flow
1951*
79,000
27.75
Dec 09, 1950
1997*
75,600
34.88
Jan 05, 1997
1969*
52,600
34.55
Jan 27, 1969
1938*
51,200
26.64
Mar 16, 1938
1956*
50,900
26.89
Dec 25, 1955
1983*
45,100
31.49
Mar 07, 1983
 * Discharge affected by regulation or diversion
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ019)
Tonight: Clear. Lows 53 to 59. Northwest winds up to 15 mph.

Sunday: Sunny. Highs 74 to 84. Northwest winds up to 15 mph with gusts to around 25 mph.

Sunday Night: Clear, cooler. Lows 45 to 51. Northwest winds 10 to 15 mph with gusts to around 30 mph.

Monday: Partly cloudy with a slight chance of rain showers in the morning, then partly cloudy in the afternoon. Highs 63 to 71. Southwest winds up to 10 mph shifting to the west with gusts to around 25 mph in the afternoon.

Monday Night: Mostly clear. Lows 44 to 50. West winds up to 15 mph. Gusts up to 30 mph decreasing to 20 mph after midnight.

Tuesday: Mostly sunny. Highs 65 to 74.

Tuesday Night: Clear. Lows 46 to 52.

Wednesday through Thursday: Clear. Highs 76 to 86. Lows 46 to 55.

Thursday Night through Saturday: Mostly clear. Lows 52 to 59. Highs 79 to 89.
Flood Impacts
37.29 FeetStages above 37.3 feet results in flooding outside the levees. Top of levee.
29.6 FeetHomes along east bank of river on Airport Court in Manteca experience flooding.
26.0 FeetSevere seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises.
24.5 FeetMonitor Stage - water reaches the toe of levee.
21.0 FeetSeepage begins into crop area outside of levees.
Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS Sacramento Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.