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
2022*
2,600
10.83
Dec 29, 2021
2021*
2,470
10.76
Jan 31, 2021
2020*
6,130
14.29
Dec 9, 2019
2019*
17,200
21.82
Mar 13, 2019
2018*
11,000
17.83
Apr 8, 2018
 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)
Today: Partly cloudy. A slight chance of rain showers in the morning. Highs 56 to 65. Northwest winds up to 10 mph.

Tonight: Mostly cloudy. Lows 41 to 47. Northwest winds up to 10 mph.

Friday: Mostly cloudy. A slight chance of rain showers in the morning, then a chance of rain showers in the afternoon. Breezy. Highs 51 to 61. Southeast winds up to 10 mph with gusts to around 20 mph increasing to 10 to 25 mph with gusts to around 35 mph in the afternoon.

Friday Night: Rain showers. Windy. Lows 43 to 50. Southeast winds 15 to 30 mph with gusts to around 40 mph.

Saturday: Mostly cloudy. A chance of rain showers in the morning, then rain showers likely and a slight chance of thunderstorms in the afternoon. Highs 54 to 64. Southeast winds 10 to 15 mph with gusts to around 25 mph.

Saturday Night: Mostly cloudy with a slight chance of showers and thunderstorms. Lows 42 to 47.

Sunday: Mostly cloudy with a slight chance of rain showers. Highs 57 to 66.

Sunday Night: Mostly clear. Lows 40 to 46.

Monday through Wednesday: Clear. Highs 66 to 76. Lows 41 to 51.
Impacts - E19 Information
21.0 FeetSeepage begins into crop area outside of levees.
24.5 FeetMonitor Stage. Water reaches the toe of levee.
26.0 FeetSevere seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises.
29.6 FeetHomes along east bank of river on Airport Court in Manteca experience flooding.
37.3 FeetStages above 37.3 Feet results in flooding outside the levees. Top of levee.
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.