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: Patchy fog in the morning. Mostly cloudy. Warmer. Highs 58 to 66. Southeast winds up to 15 mph. Gusts up to 30 mph in the afternoon.

Tonight: Rain, breezy. Lows 42 to 47. South winds 10 to 25 mph with gusts to around 45 mph.

Sunday: Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Highs 49 to 57. Southwest winds 10 to 15 mph with gusts to around 30 mph.

Sunday Night: Mostly cloudy in the evening then clearing. Lows 35 to 41. Northwest winds up to 15 mph. Gusts up to 30 mph decreasing to 20 mph after midnight.

Monday: Mostly sunny. Highs 52 to 59. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Monday Night: Clear. Lows 33 to 39.

Tuesday: Mostly sunny. Areas of frost. Highs 55 to 60.

Tuesday Night and Wednesday: Mostly clear. Lows 36 to 42. Highs around 59.

Wednesday Night and Thursday: Clear. Lows 34 to 40. Highs 58 to 63.

Thursday Night and Friday: Mostly clear. Lows 36 to 42. Highs 61 to 67.
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.