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
Issuance Time: Mar 28 2024 at 1:53 PM PDTNext Issuance: Mar 29 2024 at 9:00 AM PDT
Monitor Stage: 24.5 FeetFlood Stage: 29.0 FeetDanger Stage: 29.5 Feet

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.
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.

Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.
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
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)
Today: A slight chance of rain showers in the late morning and early afternoon. Rain showers late in the afternoon. Breezy. Highs 50 to 59. South winds up to 10 mph with gusts to around 20 mph increasing to southeast 15 to 25 mph with gusts to around 40 mph in the afternoon.

Tonight: Rain showers in the evening, then a slight chance of rain showers after midnight. Windy. Lows 43 to 49. Southeast winds 15 to 30 mph with gusts to around 40 mph decreasing to 10 to 20 mph with gusts to around 30 mph after midnight.

Saturday: Mostly cloudy. A chance of rain showers in the morning, then rain showers likely and a slight chance of thunderstorms in the afternoon. Warmer. Highs 55 to 65. Southeast winds 10 to 15 mph with gusts to around 25 mph.

Saturday Night: Mostly cloudy. A slight chance of showers and thunderstorms in the evening. Lows 41 to 47. East winds 10 to 15 mph shifting to the north after midnight.

Sunday: Mostly cloudy. Highs 58 to 67. Northwest winds up to 10 mph.

Sunday Night: Mostly clear. Lows 40 to 46.

Monday: Sunny. Highs 63 to 72.

Monday Night through Wednesday: Clear. Lows 43 to 52. Highs 66 to 76.

Wednesday Night and Thursday: Mostly clear. Lows 45 to 50. Highs 64 to 74.
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.