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
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
Official 7 Day National Weather Service Forecast   (CAZ019)
Today: Sunny. Highs 74 to 84. Northwest winds up to 15 mph with gusts to around 25 mph.

Tonight: Clear, colder. Lows 43 to 51. Northwest winds up to 15 mph with gusts to around 30 mph.

Monday: Partly cloudy with a slight chance of rain showers in the morning, then partly cloudy in the afternoon. Highs 62 to 71. South winds up to 10 mph shifting to the west with gusts to around 25 mph in the afternoon.

Monday Night: Mostly clear. Lows 44 to 50. West winds up to 15 mph with gusts to around 25 mph.

Tuesday: Mostly sunny. Highs 65 to 75. Northwest winds up to 15 mph. Gusts up to 25 mph in the afternoon.

Tuesday Night: Clear. Lows 46 to 52.

Wednesday: Sunny, warmer. Highs 74 to 82.

Wednesday Night and Thursday: Clear. Lows 49 to 55. Highs 76 to 86.

Thursday Night: Mostly clear. Lows 54 to 60.

Friday: Partly cloudy. Highs 79 to 89.

Friday Night and Saturday: Mostly clear. Lows 52 to 58. Highs 77 to 87.
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.