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		Bulletin Group: San Joaquin		River Group: San Joaquin

Monitor Stage: 24.5 Feet

Flood Stage: 29.0 Feet

Danger Stage: 29.5 Feet

Plot Type:

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/div>
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

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.

Official 7 Day National Weather Service Forecast (CAZ019)

Tonight: Clear. Lows 49 to 55. Northwest winds up to 15 mph with gusts to around 25 mph.

Thursday: Sunny. Highs 77 to 86. West winds up to 10 mph with gusts to around 20 mph.

Thursday Night: Clear. Lows 50 to 56. Northwest winds up to 15 mph with gusts to around 25 mph.

Friday: Sunny. Highs 81 to 89. Northwest winds up to 15 mph.

Friday Night: Clear. Lows 54 to 60. Northwest winds 10 to 15 mph.

Saturday: Sunny. Highs 85 to 93.

Saturday Night: Mostly clear. Lows 57 to 63.

Sunday: Mostly sunny. Highs 87 to 96.

Sunday Night through Monday Night: Partly cloudy. Lows 55 to 64. Highs 85 to 95.

Tuesday: Partly cloudy with a slight chance of rain showers. Highs 76 to 86.

Tuesday Night: Mostly cloudy. Lows 54 to 60.

Wednesday: Partly cloudy. Highs 75 to 84.

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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