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: Cooler. A chance of rain showers early in the morning, then rain showers in the late morning and early afternoon. A chance of rain showers late in the afternoon. Highs 51 to 61. Southeast winds 10 to 15 mph with gusts to around 35 mph.

Tonight: Mostly cloudy with a chance of rain showers. Lows 41 to 47. Southeast winds 10 to 20 mph with gusts to around 40 mph.

Sunday: Mostly cloudy with a slight chance of rain showers. Highs 55 to 63. Southeast winds 10 to 15 mph.

Sunday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 41 to 47. Northwest winds around 10 mph.

Monday: Mostly sunny. Warmer. Highs 61 to 71. Northwest winds up to 10 mph.

Monday Night: Clear. Lows 44 to 50.

Tuesday: Sunny, warmer. Highs 70 to 77.

Tuesday Night through Wednesday Night: Mostly clear. Lows 49 to 58. Highs 72 to 82.

Thursday and Thursday Night: Partly cloudy. Highs 77 to 84. Lows 52 to 58.

Friday: Mostly sunny. Highs 75 to 83.
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.