CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SAN JOAQUIN RIVER - MOSSDALE (MOSC1)

Latitude: 37.79º N	Longitude: 121.31º W	Elevation: 32 Feet
Location: San Joaquin County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Issuance Time:

Jul 20 2025 at 7:08 AM PDT

Next Issuance:

Jul 21 2025 at 9:00 AM PDT

Action/Monitor: 19.5 Feet

Minor Flood: 28.5 Feet

Moderate Flood: 32.1 Feet

Major Flood: 33.1 Feet

Plot Type:

Please Note:
1) 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.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View California Department of Water Resources Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024	--	11.32	Mar 6, 2024
2023	--	20.52	Mar 24, 2023
2022	--	7.51	Oct 24, 2021
2021	--	6.74	Jun 27, 2021
2020	--	7.93	Dec 13, 2019
Historical High Stage/Flow Events (Period of Record - Jan 1920 to Present)* - Ranked by Stage
1951	--	24.40**	Dec 10, 1950
1997	--	23.24**	Jan 9, 1997
2017	--	21.70	Feb 23, 2017
1969	--	20.31**	Jan 27, 1969
1967	--	18.10**	Jan 24, 1967
2006	--	17.19**	Apr 13, 2006
* No data was available Sep 2006 to Apr 2007
** Datum changed from NGVD29 to NAVD88 on 10/01/2006. The difference is +2.38 ft and must be applied to all data before date to convert to NAVD88

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
33.1 Feet	Stages above 33.1 feet result in flooding outside of the levees. Top of levee.
16.39 Feet	Historically Mossdale Trailer Park evacuates.
15.4 Feet	Mossdale Trailer Park is threatened by the high water. Mossdale Trailer Park is on the south side of the river inside the levee both upstream and downstream of the gage.

Official 7 Day National Weather Service Forecast (CAZ019)

Today: Sunny. Highs 80 to 88. West winds up to 15 mph. Gusts up to 25 mph in the afternoon.

Tonight: Clear. Lows 53 to 59. Northwest winds up to 15 mph with gusts to around 25 mph.

Tuesday: Mostly sunny. Highs 77 to 85. West winds up to 10 mph.

Tuesday Night: Mostly clear. Lows 53 to 59. Northwest winds 10 to 15 mph.

Wednesday: Mostly sunny. Highs 79 to 87. Northwest winds up to 10 mph.

Wednesday Night: Clear. Lows 53 to 59.

Thursday: Sunny. Highs 80 to 87.

Thursday Night through Saturday: Clear. Lows 53 to 59. Highs 79 to 87.

Saturday Night: Mostly clear. Lows 53 to 59.

Sunday: Sunny. Highs 82 to 90.

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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Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.