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: Apr 13 2024 at 8:23 AM PDTNext Issuance: Apr 14 2024 at 9:00 AM PDT
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)
Today: Cooler. A chance of rain showers early in the morning, then rain showers in the late morning and early afternoon. A chance of rain showers late in the afternoon. Highs 50 to 59. South winds 10 to 15 mph shifting to the southeast in the afternoon. Gusts up to 25 mph.

Tonight: Mostly cloudy with a slight chance of rain showers. Lows around 44. Southeast winds 10 to 15 mph with gusts to around 25 mph.

Sunday: Mostly cloudy. A slight chance of rain showers in the morning. Highs 55 to 61. East winds around 10 mph shifting to the north in the afternoon.

Sunday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows around 43. Northwest winds up to 10 mph.

Monday: Mostly sunny. Warmer. Highs 65 to 71. Northwest winds up to 10 mph.

Monday Night: Clear. Lows around 47.

Tuesday: Mostly sunny. Highs 72 to 78.

Tuesday Night through Wednesday Night: Mostly clear. Lows 49 to 57. Highs 72 to 82.

Thursday: Partly cloudy. Highs 78 to 84.

Thursday Night and Friday: Mostly clear. Lows around 54. Highs 77 to 84.
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.