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

*** IMPORTANT ***  Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.
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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
Action/Monitor: 24.5 FeetMinor Flood: 29.0 FeetModerate Flood: 32.0 FeetMajor Flood: 37.3 Feet

San Joaquin River - Vernalis (VNSC1)Latest Observation - 06/01/2025 at 4:45 AM PDT : 10.05 Ft | 2,357 cfs

Combination chart with 2 data series.
Graphic Created: 06/01/2025 at 5:15 AM PDT
The chart has 1 X axis displaying Observation Time (Pacific Local Time). Range: 2025-05-22 05:15:01 to 2025-06-01 05:15:01.
The chart has 2 Y axes displaying Stage (Feet) and Flow (Cubic Feet per Second).
End of interactive chart.
Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View US Geological Survey (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
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.
Official 7 Day National Weather Service Forecast   (CAZ019)
Today: Partly cloudy in the morning then clearing. Highs 87 to 97. West winds up to 10 mph. Gusts up to 25 mph in the afternoon.

Tonight: Clear, cooler. Lows 50 to 58. Northwest winds up to 15 mph. Gusts up to 25 mph in the evening.

Monday: Sunny. Highs 85 to 92. Northwest winds up to 10 mph.

Monday Night: Clear. Lows 53 to 61. Northwest winds up to 10 mph with gusts to around 20 mph.

Tuesday: Sunny. Highs 84 to 93. Northwest winds up to 10 mph.

Tuesday Night: Clear. Lows 54 to 62.

Wednesday: Sunny. Highs 86 to 94.

Wednesday Night through Saturday: Clear. Lows 55 to 65. Highs 87 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.