CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

COSUMNES RIVER - MICHIGAN BAR (MHBC1)

Latitude: 38.50º N	Longitude: 121.04º W	Elevation: 168 Feet
Location: Sacramento County in California		Bulletin Group: San Joaquin		River Group: North San Joaquin

Issuance Time:

Dec 25 2025 at 2:10 PM PST

Next Issuance:

Dec 26 2025 at 9:00 AM PST

Action/Monitor: 7.0 Feet

Minor Flood: 12.0 Feet

Moderate Flood: 16.0 Feet

Major Flood: 18.0 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 Geological Survey (USGS). View US Geological Survey (USGS) Data for this station location.

Historical Stage/Flow Data
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025	8,240	8.61	Feb 14, 2025
2024	10,100	9.16	Mar 2, 2024
2023	67,900	16.83	Dec 31, 2022
2022	14,000	10.11	Oct 25, 2021
2021	3,140	6.56	Jan 28, 2021
Historical High Stage/Flow Events (Period of Record - Oct 1907 to Present) - Ranked by Flow
1997	93,000	18.54	Jan 02, 1997
1907	71,000*	16.30	Mar 19, 1907
2023	67,900	16.83	Dec 31, 2022
2017	49,700	15.19	Feb 10, 2017
1986	45,100	14.76	Feb 17, 1986
1956	42,000	14.59	Dec 23, 1955
* Estimated

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
13.2 Feet	Water floods houses in Wilton. The south bank levee near Wilton is overtopped.
12.0 Feet	Water flows on to the road near Wilton.
8.0 Feet	Low lying lands along the river begin to flood.

Official 7 Day National Weather Service Forecast (CAZ017)

Tonight: Rain showers and a slight chance of thunderstorms until early morning, then a slight chance of rain late in the night. Breezy. Some thunderstorms may produce heavy rainfall until early morning. Lows around 48. South winds 15 to 25 mph with gusts to around 45 mph.

Friday: Mostly cloudy. A chance of rain in the morning, then rain likely in the afternoon. Breezy. Highs 49 to 56. South winds 10 to 25 mph with gusts to around 35 mph.

Friday Night: Mostly cloudy. Rain likely and a slight chance of thunderstorms in the evening, then a chance of rain after midnight. Lows around 45. South winds 10 to 15 mph with gusts to around 25 mph.

Saturday: Mostly cloudy. A slight chance of rain in the morning. Highs around 49. North winds up to 10 mph.

Saturday Night: Mostly clear. Colder. Lows 35 to 41. North winds around 10 mph. Gusts up to 25 mph after midnight.

Sunday: Partly cloudy. Highs around 48.

Sunday Night: Partly cloudy. Lows around 37.

Monday: Mostly cloudy. Highs around 49.

Monday Night: Partly cloudy. Lows around 36.

Tuesday: Mostly cloudy. Highs around 51.

Tuesday Night: Mostly clear. Lows around 38.

Wednesday: Partly cloudy. Highs around 50.

Wednesday Night: Mostly clear. Lows around 40.

New Years Day: Mostly cloudy with a slight chance of rain. Highs around 49.

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.

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