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: 40.0 FeetFlood Stage: 46.0 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
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
2017*
33,900
43.99
Jan 11, 2017
 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
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ017)
Today: Mostly cloudy. Patchy fog in the morning. A slight chance of rain late in the afternoon. Highs 54 to 64. Light winds becoming southeast 10 to 15 mph with gusts to around 30 mph in the afternoon.

Tonight: Rain, breezy. Lows around 45. South winds 15 to 25 mph with gusts to around 40 mph.

Sunday: Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Highs 51 to 58. Southwest winds 10 to 15 mph with gusts to around 30 mph.

Sunday Night: Mostly cloudy in the evening then clearing. Lows around 37. Southwest winds 10 to 15 mph shifting to the north after midnight.

Monday: Patchy frost in the morning. Mostly sunny. Highs around 58. North winds 10 to 15 mph with gusts to around 25 mph.

Monday Night: Clear. Lows 34 to 39.

Tuesday: Mostly sunny. Areas of frost. Highs around 58.

Tuesday Night and Wednesday: Mostly clear. Lows around 39. Highs around 60.

Wednesday Night and Thursday: Clear. Lows 35 to 41. Highs around 62.

Thursday Night and Friday: Mostly clear. Lows 36 to 41. Highs 59 to 65.
Impacts - E19 Information
40.0 FeetMonitor Stage - 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.
39.0 FeetThe Cosumnes River overflow channel begins to flow.
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.