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 04 2024 at 8:39 AM PSTNext Issuance: Mar 04 2024 at 3:00 PM PST
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)
Tonight: Mostly cloudy. Lows 40 to 46. Light winds becoming southeast up to 10 mph after midnight.

Tuesday: Partly cloudy in the morning then becoming mostly cloudy. Highs 56 to 65. Southeast winds up to 10 mph.

Tuesday Night: Mostly cloudy. A slight chance of rain showers after midnight. Lows 42 to 48. South winds around 10 mph shifting to the east up to 10 mph after midnight.

Wednesday: Mostly cloudy with a slight chance of rain showers. Highs 57 to 66. East winds up to 10 mph.

Wednesday Night: Partly cloudy. Lows 41 to 47. Northwest winds up to 10 mph.

Thursday: Mostly cloudy. Highs 56 to 64.

Thursday Night: Clear. Lows 38 to 44.

Friday and Friday Night: Clear. Highs 59 to 67. Lows 38 to 45.

Saturday through Sunday: Partly cloudy. Highs 58 to 66. Lows 39 to 46.

Sunday Night and Monday: Mostly cloudy with a slight chance of rain showers. Lows 42 to 48. Highs 58 to 66.
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.