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
Issuance Time: Jan 30 2023 at 1:28 PM PSTNext Issuance: Jan 31 2023 at 9:00 AM PST
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.

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
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
2017*
41,000
30.73
Feb 23, 2017
 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)
Tonight: Clear. Areas of frost after midnight. Widespread frost late in the night. Lows 26 to 34. Northwest winds 10 to 15 mph.

Tuesday: Widespread frost in the morning. Sunny. Highs around 52. Northwest winds up to 10 mph shifting to the south around 10 mph in the afternoon.

Tuesday Night: Mostly clear. Areas of frost after midnight. Lows 29 to 37. Southeast winds up to 10 mph.

Wednesday: Widespread frost in the morning. Mostly sunny. Highs 54 to 60. Southeast winds up to 10 mph.

Wednesday Night: Partly cloudy. Lows 32 to 40. Southeast winds up to 10 mph.

Thursday: Mostly cloudy. Highs 54 to 62.

Thursday Night: Cloudy with a chance of rain showers. Lows around 44.

Friday: Mostly cloudy with a slight chance of rain showers. Highs 53 to 59.

Friday Night: Partly cloudy. Lows 36 to 42.

Saturday: Mostly cloudy. Highs 54 to 60.

Saturday Night and Sunday: Mostly cloudy with a chance of rain showers. Lows 40 to 45. Highs 51 to 58.

Sunday Night: Mostly cloudy with a slight chance of rain showers. Lows 36 to 42.

Monday: Mostly cloudy. Highs 52 to 59.
Impacts - E19 Information
21.0 FeetSeepage begins into crop area outside of levee.
26.0 FeetSevere seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises.
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.