CNRFC - Hydrology - Observed River/Reservoir Conditions

SAN JOAQUIN RIVER - VERNALIS (VNSC1)

Latitude: 37.68º N	Longitude: 121.27º W	Elevation: 35 Feet
Location: San Joaquin County in California		River Group: San Joaquin

Monitor Stage: 24.5 Feet

Flood Stage: 29.0 Feet

Danger Stage: 29.5 Feet

Observed Data Credit
	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
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
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ019)

Tonight: Mostly cloudy. Lows 48 to 54. West winds 10 to 15 mph with gusts to around 35 mph.

Friday: Mostly cloudy. A chance of rain showers and a slight chance of thunderstorms in the afternoon. Highs 60 to 69. West winds 10 to 15 mph with gusts to around 30 mph.

Friday Night: Partly cloudy in the evening then clearing. Lows 44 to 50. Northwest winds 10 to 15 mph with gusts to around 30 mph.

Saturday: Sunny, warmer. Highs 67 to 75. Northwest winds up to 15 mph.

Saturday Night: Mostly clear. Lows 46 to 52. Northwest winds 10 to 15 mph.

Sunday: Sunny. Highs 70 to 78.

Sunday Night: Clear. Lows 45 to 51.

Monday through Wednesday Night: Clear. Highs 73 to 83. Lows 46 to 56.

Thursday: Mostly sunny. Highs 70 to 79.

Impacts - E19 Information
21.0 Feet	Seepage begins into crop area outside of levees.
24.5 Feet	Monitor Stage. Water reaches the toe of levee.
26.0 Feet	Severe seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises.
29.6 Feet	Homes along east bank of river on Airport Court in Manteca experience flooding.
37.3 Feet	Stages 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.

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