CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

COSUMNES RIVER - MICHIGAN BAR (MHBC1)

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

Issuance Time:

Oct 10 2026 at 8:04 AM PDT

Next Issuance:

Oct 11 2026 at 9:00 AM PDT

Action: 7.0 Feet

Minor Flood: 10.0 Feet

Moderate Flood: 12.0 Feet

Major Flood: 14.0 Feet

Please Note:

On October 1, 2026, flood stages for this location changed to the following: Minor: 10.0 ft, Moderate: 12.0 ft, Major: 14.0 ft. Details

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 Gauge)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

2) At extremely low river flows, the "Observed (Raw Gauge)" 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
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025	10,700	9.32	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
16.0 Feet	Jackson Road at Sloughhouse may flood; levee breaks are known to occur at this level.
14.0 Feet	Major Flood Stage - Flooding along Dillard Road cuts off CA-99 access. Multiple stretches of CA-99 and Green Road flood. Levees overtop near Wilton Road.
13.0 Feet	Dillard Road floods in multiple locations. CA-99 begins to overtop.
12.0 Feet	Moderate Flood Stage - Dillard Road and Green Road (between Sunflower Rd and Magos Rd) flood. Farmland between Deer Creek and the Cosumnes River levee floods. Lower-elevation levees overtop.
10.0 Feet	Minor Flood Stage (Flood Warning) - River begins leaving the channel, with water heading toward Green Road.
7.0 Feet	Action Stage.

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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