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

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MORMON SLOUGH - BELLOTA (MSGC1)
Latitude: 38.05º NLongitude: 121.01º WElevation: 130 Feet
Location: San Joaquin County in CaliforniaBulletin Group: San JoaquinRiver Group: North San Joaquin
Action/Monitor: 16.0 FeetMinor Flood: 22.0 FeetModerate Flood: 30.9 FeetMajor Flood: 31.9 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Army Corps of Engineers.
View US Army Corps of Engineers Data for this station location.

Historical Mean Daily Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2025* 904 6.89 Feb 15, 2025
2024* 1,100 7.44 Mar 3, 2024
2023* 11,400 21.80 Jan 16, 2023
2022* 1,950 9.21 Oct 25, 2021
2021* 839 6.78 Jan 28, 2021
 Historical High Stage/Flow Events (Period of Record - Dec 1997 to Present) - Ranked by Flow
2023* 11,400 21.80 Jan 16, 2023
1998* 9,395 18.48 Feb 3, 1998
2006* 9,328 18.40 Apr 4, 2006
2011* 8,354 17.22 Mar 24, 2011
 * Discharge affected by regulation or diversion
Location Photographs
ESRI™ Locator Map
Flood Impacts
31.9 FeetTop of Levee right bank levee. Water will overflow toward Bellota and Highway 26.
23.0 FeetDanger Stage
22.0 FeetFlood Stage
16.0 FeetMonitor Stage - Bike trail within lower Calaveras River channel flooded.
14.2 FeetUOP research within the Calaveras River channel is affected by water levels.
9.0 FeetWater rises out of the pilot channel but not yet on the levee slopes.
Official 7 Day National Weather Service Forecast   (CAZ019)
Today: Rain showers early in the morning, then a chance of rain showers in the late morning and afternoon. A slight chance of thunderstorms late in the afternoon. Highs 52 to 60. South winds 10 to 15 mph. Gusts up to 35 mph decreasing to 25 mph in the afternoon.

Tonight: Mostly cloudy. A slight chance of rain showers in the evening. Lows 42 to 48. South winds up to 10 mph.

Tuesday: Mostly cloudy in the morning then becoming partly cloudy. Highs 53 to 61. Light winds.

Tuesday Night: Mostly clear. Lows 43 to 49. Light winds.

Wednesday: Partly cloudy. Highs 54 to 62. Light winds.

Wednesday Night: Mostly cloudy with a chance of rain showers. Lows 46 to 52.

Thursday: Mostly cloudy with a chance of rain showers. Highs 54 to 60.

Thursday Night: Mostly cloudy with a chance of rain showers. Lows 43 to 49.

Friday: Partly cloudy. Highs 56 to 62.

Friday Night through Sunday: Mostly clear. Lows 40 to 47. Highs 57 to 63.
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.