CNRFC - Hydrology - River Guidance - Graphical RVF

*** IMPORTANT *** Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.

Location:

MORMON SLOUGH - BELLOTA (MSGC1)

Latitude: 38.05º N	Longitude: 121.01º W	Elevation: 130 Feet
Location: San Joaquin County in California		Bulletin Group: San Joaquin		River Group: North San Joaquin

Issuance Time:

Jun 16 2025 at 6:03 AM PDT

Next Issuance:

Jun 17 2025 at 9:00 AM PDT

Action/Monitor: 16.0 Feet

Minor Flood: 22.0 Feet

Moderate Flood: 30.9 Feet

Major Flood: 31.9 Feet

Plot Type:

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

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
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
31.9 Feet	Top of Levee right bank levee. Water will overflow toward Bellota and Highway 26.
23.0 Feet	Danger Stage
22.0 Feet	Flood Stage
16.0 Feet	Monitor Stage - Bike trail within lower Calaveras River channel flooded.
14.2 Feet	UOP research within the Calaveras River channel is affected by water levels.
9.0 Feet	Water rises out of the pilot channel but not yet on the levee slopes.

Official 7 Day National Weather Service Forecast (CAZ019)

Today: Sunny. Highs 83 to 91. Northwest winds up to 15 mph. Gusts up to 25 mph in the afternoon.

Tonight: Clear. Lows 50 to 58. Northwest winds up to 15 mph with gusts to around 25 mph.

Tuesday: Sunny. Highs 87 to 94. Northwest winds up to 10 mph with gusts to around 20 mph.

Tuesday Night: Clear. Lows 55 to 63. Northwest winds up to 15 mph.

Wednesday: Sunny. Highs 92 to 100. Northwest winds up to 10 mph. Gusts up to 20 mph in the afternoon.

Wednesday Night: Clear. Lows 55 to 63.

juneteenth: Sunny. Highs 86 to 94.

Thursday Night through Friday Night: Clear. Lows 50 to 57. Highs 83 to 93.

Saturday and Saturday Night: Clear. Highs 76 to 84. Lows 50 to 60.

Sunday: Sunny. Highs 82 to 90.

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.

NWS RSS Feed

Verification - Historical Graphical RVF
Month:	Day:	Year:	Cycle:
To view other verification locations, use our Historical Graphical River Forecast Interface.