CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

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

Issuance Time:

Jan 18 2025 at 7:43 AM PST

Next Issuance:

Jan 19 2025 at 9:00 AM PST

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:

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

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
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

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: Areas of frost and patchy dense fog in the morning. Mostly sunny. Highs around 56. Light winds.

Tonight: Clear. Patchy fog after midnight. Lows 32 to 42. Light winds. Gusts up to 25 mph after midnight.

Martin Luther King Jr Day: Areas of frost in the morning. Sunny. Highs 56 to 63. North winds 10 to 20 mph with gusts to around 35 mph.

Monday Night: Clear. Lows 31 to 38. North winds up to 15 mph with gusts to around 30 mph.

Tuesday: Widespread frost in the morning. Mostly sunny. Highs around 57. Light winds.

Tuesday Night: Mostly clear. Areas of frost. Lows 30 to 38.

Wednesday: Sunny. Widespread frost. Highs 57 to 63.

Wednesday Night: Clear. Lows 33 to 42.

Thursday: Sunny. Areas of frost. Highs around 62.

Thursday Night through Friday Night: Mostly clear. Lows 34 to 44. Highs around 61.

Saturday: Partly cloudy with a slight chance of rain showers. Highs 54 to 60.

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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Verification - Historical Graphical RVF
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