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 CaliforniaRiver Group: San Joaquin
Monitor Stage: 38.5 FeetFlood Stage: 44.5 Feet

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.

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
Official 7 Day National Weather Service Forecast   (CAZ017)
Today: Mostly cloudy. A chance of rain showers in the morning, then rain showers likely in the afternoon. Highs 48 to 55. South winds 10 to 15 mph with gusts to around 25 mph.

Tonight: Mostly cloudy. A chance of rain showers in the evening, then a slight chance of rain showers after midnight. Lows 35 to 41. South winds 10 to 15 mph.

Monday: Mostly cloudy with a slight chance of rain showers. Highs 50 to 57. South winds around 10 mph. Gusts up to 20 mph in the afternoon.

Monday Night: Mostly cloudy with a chance of rain showers. Lows around 47. South winds 10 to 15 mph with gusts to around 25 mph.

Tuesday: Rain showers likely. Highs 55 to 61. South winds 10 to 15 mph with gusts to around 25 mph.

Tuesday Night: Mostly cloudy with a chance of rain showers. Lows around 46.

Wednesday: Mostly cloudy with a chance of rain showers. Highs 56 to 62.

Wednesday Night and Thursday: Mostly clear. Lows around 42. Highs 59 to 65.

Thursday Night and Friday: Clear. Lows around 39. Highs 60 to 66.

Friday Night: Mostly clear. Lows around 43.

Saturday: Mostly cloudy with a slight chance of rain showers. Highs 59 to 64.
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.
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.