National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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COSUMNES RIVER - MCCONNELL (MCNC1)
Latitude: 38.36º NLongitude: 121.34º WElevation: 5 Feet
Location: Sacramento County in CaliforniaBulletin Group: San JoaquinRiver Group: North San Joaquin
Issuance Time: Feb 25 2024 at 7:44 AM PSTNext Issuance: Feb 26 2024 at 9:00 AM PST
Monitor Stage: 38.5 FeetFlood 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.
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
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Raw streamflow data is provided by the California Department of Water Resources.
View CA DWR Data for this station location.

Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.
Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
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
2018*
24,200
42.92
Mar 23, 2018
 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
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.
Location Photographs
ESRI™ Locator Map
Impacts - E19 Information
41.5 FeetThe Cosumnes River overflow channel begins to flow.
46.5 FeetAt 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.
Official 7 Day National Weather Service Forecast   (CAZ017)
Tonight: Mostly clear. Lows around 47. South winds up to 10 mph.

Monday: Mostly cloudy. A slight chance of rain showers in the morning, then a chance of rain showers in the afternoon. Highs 58 to 65. South winds up to 15 mph.

Monday Night: Mostly cloudy with a slight chance of rain showers in the evening, then mostly clear after midnight. Lows around 39. Southwest winds 10 to 15 mph shifting to the northwest after midnight.

Tuesday: Sunny. Highs 56 to 62. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Tuesday Night: Clear. Lows 35 to 41. Northwest winds up to 15 mph.

Wednesday: Mostly sunny. Highs 60 to 65.

Wednesday Night: Partly cloudy. Lows around 45.

Thursday: Mostly cloudy with a chance of rain showers. Highs 54 to 63.

Thursday Night: Rain showers. Lows around 48.

Friday: Rain showers. Breezy. Highs 51 to 59.

Friday Night and Saturday: Rain showers. Breezy. Lows 38 to 43. Highs 48 to 54.

Saturday Night: Mostly cloudy with a chance of rain showers. Lows around 36.

Sunday: Partly cloudy with a slight chance of rain showers. Highs 51 to 57.
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.