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
Issuance Time: Jul 06 2025 at 7:32 AM PDTNext Issuance: Jul 07 2025 at 9:00 AM PDT
Action/Monitor: 16.0 FeetMinor Flood: 22.0 FeetModerate Flood: 30.9 FeetMajor Flood: 31.9 Feet

Mormon Slough - Bellota (MSGC1)River Forecast Plot

Combination chart with 4 data series.
Forecast Posted: 07/06/2025 at 7:28 AM PDT ● Graphic Created: 07/06/2025 at 7:32 AM PDT
The chart has 1 X axis displaying Time. Range: 2025-07-01 14:00:00 to 2025-07-11 14:00:00.
The chart has 2 Y axes displaying Precipitation (In.) and Precipitation (In.).
End of interactive chart.

Chart

Combination chart with 7 data series.
The chart has 1 X axis displaying Observation / Forecast Time (Pacific Local Time). Range: 2025-07-01 07:00:00 to 2025-07-11 07:00:00.
The chart has 2 Y axes displaying Stage (Feet) and Flow (Cubic Feet per Second).
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 US Army Corps of Engineers.
View US Army Corps of Engineers 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*
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
2020*
308
5.17
Mar 17, 2020
 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
 * 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: Sunny. Highs 88 to 96. Northwest winds up to 10 mph.

Tonight: Clear. Lows 54 to 64. Northwest winds up to 10 mph.

Monday: Sunny. Highs 89 to 96. Northwest winds up to 10 mph.

Monday Night: Clear. Lows 54 to 62. Northwest winds around 10 mph with gusts to around 20 mph.

Tuesday: Sunny. Highs 86 to 94. Northwest winds up to 10 mph.

Tuesday Night: Clear. Lows 54 to 62.

Wednesday: Sunny. Highs 90 to 96.

Wednesday Night through Saturday: Clear. Lows 61 to 71. Highs 92 to 102.
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.