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
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
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ017)
Tonight: Clear. Lows 58 to 68. Southwest winds up to 10 mph with gusts to around 20 mph.

Monday: Sunny. Highs 90 to 100. South winds up to 10 mph with gusts to around 20 mph.

Monday Night: Clear. Lows 56 to 65. Southwest winds 10 to 15 mph with gusts to around 25 mph.

Tuesday: Sunny. Highs 86 to 96. South winds up to 10 mph with gusts to around 20 mph.

Tuesday Night: Clear. Lows 53 to 62. Southwest winds up to 15 mph with gusts to around 25 mph.

Wednesday: Sunny. Highs 90 to 98.

Wednesday Night: Clear. Lows 57 to 67.

Thursday through Sunday: Clear. Highs 96 to 106. Lows 60 to 70.
Impacts - E19 Information
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.
44.5 FeetFlood stage.
41.5 FeetThe Cosumnes River overflow channel begins to flow.
38.5 FeetMonitor Stage.
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.