National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SAN JOAQUIN RIVER - MOSSDALE (MOSC1)
Latitude: 37.79º NLongitude: 121.31º WElevation: 32 Feet
Location: San Joaquin County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Jul 08 2025 at 7:41 AM PDTNext Issuance: Jul 09 2025 at 9:00 AM PDT
Action/Monitor: 19.5 FeetMinor Flood: 28.5 FeetModerate Flood: 32.1 FeetMajor Flood: 33.1 Feet

San Joaquin River - Mossdale (MOSC1)River Forecast Plot

Combination chart with 4 data series.
Forecast Posted: 07/08/2025 at 7:34 AM PDT ● Graphic Created: 07/08/2025 at 7:42 AM PDT
The chart has 1 X axis displaying Time. Range: 2025-07-03 14:00:00 to 2025-07-13 14:00:00.
The chart has 2 Y axes displaying Precipitation (In.) and Precipitation (In.).
End of interactive chart.

Chart

Combination chart with 6 data series.
The chart has 1 X axis displaying Observation / Forecast Time (Pacific Local Time). Range: 2025-07-03 07:00:00 to 2025-07-13 07:00:00.
The chart has 2 Y axes displaying Stage (Feet) and Stage (Feet).
End of interactive chart.
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
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Raw streamflow data is provided by the California Department of Water Resources.
View California Department of Water Resources Data for this station location.

Verification - Historical Graphical RVF
Month:  
Day:  
Year:  
Cycle:  
To view other verification locations, use our Historical Graphical River Forecast Interface.
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
ESRI™ Locator Map
Flood Impacts
33.1 FeetStages above 33.1 feet result in flooding outside of the levees. Top of levee.
16.39 FeetHistorically Mossdale Trailer Park evacuates.
15.4 FeetMossdale 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)
Tonight: Clear. Lows 54 to 62. Northwest winds 10 to 15 mph.

Wednesday: Sunny. Highs 88 to 94. Northwest winds up to 15 mph.

Wednesday Night: Clear. Lows 58 to 68. Northwest winds up to 15 mph.

Thursday: Sunny, warmer. Highs 95 to 103. Northwest winds up to 10 mph.

Thursday Night: Clear. Lows 62 to 72. Northwest winds up to 10 mph with gusts to around 20 mph.

Friday: Sunny. Highs 96 to 104.

Friday Night: Clear. Lows 60 to 70.

Saturday through Tuesday: Clear. Highs 92 to 102. Lows 59 to 69.
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.