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 CaliforniaRiver Group: San Joaquin
Monitor Stage: 19.5 FeetFlood Stage: 28.5 FeetDanger Stage: 29.5 Feet

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

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2025 -- 7.53 Feb 23, 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
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ019)
Tonight: Clear. Lows 45 to 51. Northwest winds up to 15 mph.

Tuesday: Sunny. Highs 73 to 81. Northwest winds up to 10 mph with gusts to around 20 mph.

Tuesday Night: Mostly clear. Lows 47 to 55. Northwest winds up to 15 mph.

Wednesday: Mostly sunny. Highs 75 to 83. Northwest winds up to 10 mph with gusts to around 20 mph.

Wednesday Night: Mostly clear. Lows 52 to 58. Northwest winds up to 15 mph.

Thursday: Mostly cloudy with a slight chance of rain. Highs 71 to 79.

Thursday Night: Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Lows 52 to 58.

Friday: Mostly cloudy with rain showers likely and a chance of thunderstorms. Highs 67 to 74.

Friday Night: Mostly cloudy with rain showers likely and a slight chance of thunderstorms. Lows 50 to 56.

Saturday through Sunday: Mostly cloudy with a chance of rain. Highs 61 to 71. Lows 46 to 56.

Sunday Night: Partly cloudy with a slight chance of rain. Lows 43 to 49.

Monday: Mostly sunny. Highs 65 to 72.
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.
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.