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

Action/Monitor: 38.5 Feet

Minor Flood: 44.5 Feet

Moderate Flood: 53.4 Feet

Major Flood: 53.5 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 California Department of Water Resources Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024*	13,400	42.98	Mar 2, 2024
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
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

Flood Impacts
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: Partly cloudy in the morning then clearing. Highs 68 to 75. North winds up to 10 mph.

Tonight: Clear. Lows 46 to 52. Northwest winds up to 10 mph.

Wednesday: Sunny, warmer. Highs 75 to 82. Northwest winds up to 10 mph.

Wednesday Night: Mostly clear. Lows 49 to 55. West winds up to 10 mph.

Thursday: Mostly sunny. Highs 80 to 87. Northwest winds up to 10 mph.

Thursday Night: Partly cloudy. Lows 53 to 59.

Friday: Partly cloudy. Highs 80 to 87.

Friday Night and Saturday: Partly cloudy. Lows around 54. Highs 74 to 84.

Saturday Night and Sunday: Mostly clear. Lows around 53. Highs 72 to 82.

Sunday Night and Monday: Clear. Lows 53 to 61. Highs 78 to 88.

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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