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/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

Official 7 Day National Weather Service Forecast (CAZ019)

Tonight: Mostly clear. A slight chance of rain showers early in the evening. Patchy fog late in the night. Lows 37 to 43. Northwest winds up to 10 mph.

Friday: Mostly cloudy in the morning then clearing. Areas of fog in the morning. Highs 51 to 58. Northwest winds 10 to 20 mph with gusts to around 30 mph.

Friday Night: Clear. Areas of frost after midnight. Colder. Lows 30 to 40. Northwest winds up to 15 mph with gusts to around 25 mph.

Saturday: Areas of frost in the morning. Mostly sunny. Highs 53 to 59. Northeast winds up to 10 mph.

Saturday Night: Partly cloudy. Lows 32 to 42. North winds up to 10 mph in the evening becoming light.

Sunday: Mostly cloudy. Areas of frost. Highs around 59.

Sunday Night: Partly cloudy. Lows 35 to 45.

Monday: Mostly sunny. Highs 56 to 62.

Monday Night through Wednesday: Clear. Lows 33 to 43. Highs 56 to 63.

Wednesday Night and Thursday: Mostly clear. Lows 33 to 43. Highs 57 to 63.

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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