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 cloudy in the evening then becoming partly cloudy. Patchy fog and frost late in the night. Lows 32 to 42. Northwest winds up to 10 mph.

Monday: Areas of frost and patchy fog in the morning. Mostly sunny. Highs 56 to 62. Northwest winds up to 10 mph.

Monday Night: Mostly clear. Patchy fog after midnight. Lows 34 to 44. Light winds.

Tuesday: Patchy fog and frost in the morning. Mostly sunny. Highs 55 to 61. Northwest winds up to 10 mph.

Tuesday Night: Clear. Patchy fog after midnight. Lows 32 to 42. Northwest winds up to 10 mph in the evening becoming light.

Wednesday: Mostly sunny. Patchy frost. Highs 57 to 63.

Wednesday Night: Partly cloudy. Lows 35 to 45.

Thursday and Thursday Night: Mostly cloudy. Highs 58 to 64. Lows 35 to 45.

Friday: Partly cloudy. Highs 59 to 65.

Friday Night: Mostly cloudy. Lows 35 to 45.

Saturday: Mostly sunny. Highs 60 to 66.

Saturday Night: Partly cloudy with a slight chance of rain showers. Lows 37 to 47.

Sunday: Partly cloudy with a slight chance of rain showers. Highs 58 to 64.

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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