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:

Dec 26 2025 at 2:51 PM PST

Next Issuance:

Dec 27 2025 at 9:00 AM PST

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
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025	--	6.60	Mar 21, 2025
2024	--	11.32	Mar 6, 2024
2023	--	20.52	Mar 24, 2023
2022	--	7.51	Oct 24, 2021
2021	--	6.74	Jun 27, 2021
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: Mostly sunny in the morning then becoming partly cloudy. Highs around 50. Light winds becoming northwest up to 10 mph in the afternoon.

Tonight: Partly cloudy. Patchy fog after midnight. Lows 35 to 41. Northwest winds up to 10 mph.

Sunday: Mostly cloudy in the morning then clearing. Patchy fog in the morning. Highs around 48. Light winds.

Sunday Night: Mostly clear in the evening then becoming mostly cloudy. Lows around 37. Light winds.

Monday: Mostly cloudy in the morning then becoming partly cloudy. Highs around 49. Light winds.

Monday Night: Partly cloudy. Lows around 38.

Tuesday: Mostly cloudy. Highs 48 to 54.

Tuesday Night: Mostly clear. Lows around 40.

Wednesday: Mostly cloudy. Highs 48 to 54.

Wednesday Night: Mostly cloudy with a slight chance of rain. Lows around 44.

New Years Day: Cloudy with a chance of rain. Highs around 51.

Thursday Night: Mostly cloudy with a chance of rain. Lows around 46.

Friday: Cloudy with a chance of rain. Highs around 51.

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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