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
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
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)
Today: Sunny in the morning then becoming partly cloudy. Highs 82 to 92. Northwest winds 10 to 15 mph. Gusts up to 25 mph in the afternoon.

Tonight: Mostly cloudy in the evening then clearing. Lows 53 to 59. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Friday: Mostly cloudy in the morning then becoming partly cloudy. Highs 81 to 89. Northwest winds up to 15 mph. Gusts up to 25 mph in the afternoon.

Friday Night: Mostly clear. Lows 53 to 59. West winds 10 to 20 mph.

Saturday: Partly cloudy. Highs 73 to 81. West winds 10 to 15 mph with gusts to around 25 mph.

Saturday Night: Mostly clear. Lows 49 to 55.

Sunday: Sunny. Highs 71 to 79.

Sunday Night through Monday Night: Clear. Lows 46 to 56. Highs 72 to 82.

Tuesday and Tuesday Night: Clear. Highs 82 to 92. Lows 50 to 60.

Wednesday: Sunny. Highs 88 to 96.
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.