CNRFC - Hydrology - Observed River/Reservoir Conditions

COSUMNES RIVER - MCCONNELL (MCNC1)

Latitude: 38.36º N	Longitude: 121.34º W	Elevation: 5 Feet
Location: Sacramento County in California		Bulletin Group: San Joaquin		River Group: North San Joaquin

Monitor Stage: 38.5 Feet

Flood Stage: 44.5 Feet

Please Note:

On June 20, 2023, the datum was changed from USED to NAVD88 (+2.46 feet). As a result the monitor stage was updated to 38.5 ft and flood stage was updated to 44.5 ft.

Plot Type:

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View CA DWR Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2022*	7,790	38.99	Dec 24, 2021
2021*	3,000	32.00	Jan 29, 2021
2020*	6,890	38.18	Apr 6, 2020
2019*	13,200	42.04	Feb 15, 2019
2018*	24,200	42.92	Mar 23, 2018
Historical High Stage/Flow Events (Period of Record - Jan 1952 to Present) - Ranked by Flow
1997*	--	48.50	Jan 02, 1997
1986	--	47.10	Feb 18, 1986
2006*	36,209	47.02	Jan 01, 2006
1998*	--	46.56	Feb 04, 1998
* Discharge affected by regulation or diversion
** Dataum changed from USED to NAVD88 on 06/20/2023. The difference is +2.46 ft and must be applied to all data before date to convert to NAVD88.

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Impacts - E19 Information
41.5 Feet	The Cosumnes River overflow channel begins to flow.
46.5 Feet	At approximately 44,000 cfs, water exits the river upstream and downstream of Highway 99. Dillard Road is flooded from Highway 99 to Riley Road. Twin Cities Road is flooded from Hardesty Lane to Christensen Road.

Official 7 Day National Weather Service Forecast (CAZ017)

Tonight: Mostly clear. Lows around 49. South winds up to 15 mph.

Thursday: Partly cloudy in the morning then becoming mostly cloudy. Highs 67 to 73. South winds up to 15 mph.

Thursday Night: Mostly cloudy with a slight chance of rain showers. Lows around 52. Southwest winds 10 to 15 mph with gusts to around 30 mph.

Friday: Mostly cloudy. A slight chance of rain showers in the morning, then a slight chance of showers and thunderstorms in the afternoon. Highs 65 to 72. South winds around 10 mph shifting to the west in the afternoon. Gusts up to 20 mph.

Friday Night: Mostly clear. Lows around 47. Northwest winds up to 10 mph with gusts to around 20 mph.

Saturday: Sunny. Highs 70 to 76.

Saturday Night: Clear. Lows around 49.

Sunday through Tuesday: Clear. Highs 73 to 80. Lows around 49.

Tuesday Night: Mostly clear. Lows around 49.

Wednesday: Sunny. Highs 70 to 77.

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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