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 CaliforniaBulletin Group: San JoaquinRiver 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
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
2019*
17,200
21.82
Mar 13, 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
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.
Official 7 Day National Weather Service Forecast   (CAZ019)
Tonight: Clear. Lows 50 to 58. West winds up to 15 mph with gusts to around 25 mph.

Wednesday: Sunny. Highs 80 to 89. Northwest winds up to 15 mph with gusts to around 25 mph.

Wednesday Night: Clear. Lows 54 to 62. Northwest winds up to 15 mph. Gusts up to 25 mph in the evening.

Thursday: Sunny. Highs 86 to 94. Northwest winds up to 10 mph with gusts to around 20 mph.

Thursday Night: Clear. Lows 57 to 65. Northwest winds up to 10 mph with gusts to around 20 mph.

Friday: Sunny. Highs 89 to 97.

Friday Night: Clear. Lows 54 to 62.

Saturday and Saturday Night: Clear. Highs 83 to 92. Lows 53 to 62.

Sunday through Monday Night: Mostly clear. Highs 82 to 92. Lows 54 to 64.

Tuesday: Mostly sunny. Highs 89 to 97.
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.