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



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: Jun 30, 2025 at 9:06 AM PDT
Action/Monitor: 38.5 FeetMinor Flood: 44.5 FeetModerate Flood: 53.4 FeetMajor Flood: 53.5 Feet
Please Note:Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.
Threshold Exceedance Plot                  Product Information        CSV Ensemble Files (Data in kcfs):  Forecast Group  |  MCNC1

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What information is considered in this forecast?
Verification / Historical Plots
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Location Photographs

ESRI™ Locator Map
Flood Impacts
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.
Official 7 Day National Weather Service Forecast   (CAZ017)
Today: Sunny. Highs 91 to 101. South winds up to 10 mph. Gusts up to 25 mph in the afternoon.

Tonight: Clear. Lows 56 to 66. South winds up to 15 mph with gusts to around 25 mph.

Wednesday: Sunny. Highs 90 to 100. South winds up to 10 mph.

Wednesday Night: Clear. Lows 56 to 66. South winds 10 to 15 mph with gusts to around 25 mph.

Thursday: Mostly sunny. Highs 88 to 96. South winds up to 10 mph with gusts to around 20 mph.

Thursday Night: Clear. Lows 54 to 62.

Independence Day: Sunny. Highs 83 to 91.

Friday Night through Monday: Clear. Lows 52 to 61. Highs 84 to 94.