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:

Apr 29 2025 at 8:37 AM PDT

Next Issuance:

Apr 30 2025 at 9:00 AM PDT

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:
1) 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.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.

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)

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Lows 51 to 59. South winds up to 10 mph.

Wednesday: Partly cloudy in the morning then clearing. Highs 79 to 87. Northwest winds up to 10 mph.

Wednesday Night: Clear. Lows 51 to 57. West winds up to 10 mph shifting to the south after midnight.

Thursday: Sunny. Highs 79 to 87. Southwest winds up to 10 mph.

Thursday Night: Clear. Lows 49 to 55. South winds around 10 mph with gusts to around 20 mph.

Friday: Sunny. Highs 75 to 83.

Friday Night: Mostly cloudy. Lows around 53.

Saturday: Mostly cloudy with a slight chance of rain showers. Cooler. Highs 62 to 69.

Saturday Night: Partly cloudy with a slight chance of rain showers. Lows 46 to 52.

Sunday: Partly cloudy. Highs 66 to 73.

Sunday Night through Monday Night: Mostly clear. Lows around 51. Highs 67 to 77.

Tuesday: Sunny. Highs 74 to 81.

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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