CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

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

Issuance Time:

Apr 25 2024 at 8:44 AM PDT

Next Issuance:

Apr 26 2024 at 9:00 AM PDT

Monitor Stage: 24.5 Feet

Flood Stage: 29.0 Feet

Danger Stage: 29.5 Feet

Plot Type:

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

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

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)

Today: Mostly cloudy. A slight chance of showers and thunderstorms early in the afternoon. A chance of rain showers and a slight chance of thunderstorms late in the afternoon. Highs 60 to 70. West winds 10 to 15 mph with gusts to around 30 mph.

Tonight: Mostly clear. A slight chance of showers and thunderstorms in the evening. Lows 43 to 51. West winds 10 to 15 mph. Gusts up to 35 mph decreasing to 25 mph after midnight.

Saturday: Sunny. Highs 66 to 75. Northwest winds 10 to 15 mph.

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

Sunday: Sunny. Highs 69 to 78. Northwest winds up to 15 mph.

Sunday Night: Clear. Lows 44 to 50.

Monday: Sunny. Highs 70 to 78.

Monday Night through Wednesday Night: Clear. Lows 47 to 56. Highs 72 to 82.

Thursday: Mostly sunny. Highs 72 to 80.

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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