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
2023*	73,600***	46.64***	Jan 1, 2023
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
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
2023*	73,600***	46.64***	Jan 1, 2023
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.
*** Estimated from simulated data. Gauge data not reliable from Jan 1, 2023 through Jan 10, 2023.

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Impacts - E19 Information
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.
44.5 Feet	Flood stage.
41.5 Feet	The Cosumnes River overflow channel begins to flow.
38.5 Feet	Monitor Stage.

Official 7 Day National Weather Service Forecast (CAZ017)

Today: Mostly sunny. Not as warm. Highs 79 to 89. South winds up to 10 mph with gusts to around 20 mph.

Tonight: Clear. Lows 53 to 59. South winds up to 10 mph with gusts to around 20 mph.

Wednesday: Mostly sunny. Highs 82 to 88. South winds up to 15 mph. Gusts up to 25 mph in the afternoon.

Wednesday Night: Clear. Lows 53 to 61. Southwest winds 10 to 15 mph with gusts to around 25 mph.

Thursday: Sunny. Highs 83 to 89. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Thursday Night: Clear. Lows 54 to 63.

Friday: Sunny. Highs 86 to 92.

Friday Night and Saturday: Mostly clear. Lows 55 to 62. Highs 85 to 92.

Saturday Night: Clear. Lows 54 to 62.

Sunday and Sunday Night: Mostly clear. Highs 80 to 86. Lows 54 to 62.

Monday: Partly cloudy with a slight chance of rain showers. Highs 74 to 80.

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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