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 13 2025 at 7:01 AM PST

Next Issuance:

Dec 14 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 Mean Daily Stage/Flow Data
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)

Today: Mostly cloudy. Areas of fog and locally dense in the morning. Patchy fog in the afternoon. Highs 44 to 53. Light winds.

Tonight: Mostly cloudy. Patchy fog in the evening. Areas of fog after midnight. Lows 38 to 43. Light winds.

Sunday: Mostly cloudy in the morning then becoming partly cloudy. Areas of fog and locally dense in the morning. Highs 44 to 52. Light winds.

Sunday Night: Partly cloudy. Patchy fog after midnight. Lows around 42. Light winds.

Monday: Mostly cloudy. Highs 49 to 57. Light winds.

Monday Night: Mostly cloudy. Patchy fog. Lows 43 to 49.

Tuesday: Mostly cloudy with a slight chance of rain showers. Highs around 58.

Tuesday Night: Rain showers likely. Lows around 54.

Wednesday: Mostly cloudy with a chance of rain showers. Highs around 60.

Wednesday Night: Mostly cloudy with a slight chance of rain showers. Lows around 47.

Thursday and Thursday Night: Mostly cloudy with a chance of rain showers. Highs around 55. Lows around 49.

Friday: Rain showers likely. Highs around 55.

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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Verification - Historical Graphical RVF
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