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		River Group: San Joaquin

Monitor Stage: 38.5 Feet

Flood Stage: 44.5 Feet

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

Official 7 Day National Weather Service Forecast (CAZ017)

Today: Sunny. Not as warm. Highs 77 to 87. South winds around 10 mph with gusts to around 20 mph.

Tonight: Clear. Lows 52 to 58. South winds up to 10 mph with gusts to around 20 mph.

Sunday: Mostly sunny. Highs 83 to 91. South winds up to 10 mph.

Sunday Night: Clear. Lows 53 to 61. South winds up to 10 mph with gusts to around 20 mph.

Monday: Sunny. Highs 84 to 92. South winds up to 10 mph.

Monday Night: Clear. Lows 56 to 64.

Tuesday: Sunny. Highs 87 to 93.

Tuesday Night through Thursday Night: Clear. Lows 58 to 68. Highs 89 to 99.

Friday: Mostly sunny. Highs 91 to 99.

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.

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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