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)

Today: Mostly cloudy. A chance of showers and thunderstorms early in the afternoon. A chance of rain showers and a slight chance of thunderstorms late in the afternoon. Highs 64 to 72. Southwest winds around 10 mph shifting to the northwest in the afternoon. Gusts up to 25 mph.

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

Saturday: Mostly sunny. Highs 70 to 76. Northwest winds up to 10 mph.

Saturday Night: Partly cloudy in the evening then clearing. Lows around 49. Southwest winds up to 10 mph.

Sunday: Sunny. Highs 72 to 79. West winds up to 10 mph.

Sunday Night: Clear. Lows around 48.

Monday: Sunny. Highs 73 to 79.

Monday Night through Wednesday Night: Clear. Lows around 52. Highs 73 to 83.

Thursday: Mostly sunny. Highs 73 to 79.

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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