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
2022
-- 7.51 Oct 24, 2021
2021
--
6.74
Jun 27, 2021
2020
--
7.93
Dec 13, 2019
2019
--
14.31
Jun 6, 2019
2018
--
10.43
Apr 8, 2018
 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: Partly cloudy in the morning, then mostly cloudy with a slight chance of rain showers in the afternoon. Highs 57 to 65. Northwest winds up to 10 mph.

Tonight: Mostly cloudy. A slight chance of rain showers in the evening. Colder. Lows 37 to 43. West winds up to 10 mph with gusts to around 20 mph.

Tuesday: Mostly cloudy in the morning then clearing. Highs 55 to 63. Northwest winds 10 to 15 mph.

Tuesday Night: Clear. Lows 37 to 43. Northwest winds up to 15 mph.

Wednesday: Sunny. Highs 60 to 67. South winds up to 10 mph.

Wednesday Night: Mostly clear. Lows 40 to 46.

Thursday: Mostly cloudy with a slight chance of rain showers. Highs 55 to 65.

Thursday Night and Friday: Rain showers. Lows 46 to 51. Highs 51 to 61.

Friday Night: Rain showers. Breezy. Lows 39 to 44.

Saturday and Saturday Night: Rain showers. Highs 47 to 57. Lows 34 to 44.

Sunday: Mostly cloudy with a chance of rain showers. Highs 47 to 56.
Impacts - E19 Information
33.1 FeetStages above 30.7 feet result in flooding outside the levees. Top of levee.
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.