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 - MICHIGAN BAR (MHBC1)
Latitude: 38.50º NLongitude: 121.04º WElevation: 168 Feet
Location: Sacramento County in CaliforniaBulletin Group: San JoaquinRiver Group: North San Joaquin
Issuance Time: Oct 16 2025 at 7:55 AM PDTNext Issuance: Oct 17 2025 at 9:00 AM PDT
Action/Monitor: 7.0 FeetMinor Flood: 12.0 FeetModerate Flood: 16.0 FeetMajor Flood: 18.0 Feet

Please Note:
1) 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.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.
Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View US Geological Survey (USGS) 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
2024
10,100
9.16
Mar 2, 2024
2023
67,900
16.83
Dec 31, 2022
2022
14,000
10.11
Oct 25, 2021
2021
3,140
6.56
Jan 28, 2021
2020
7,180
8.26
Apr 6, 2020
 Historical High Stage/Flow Events (Period of Record - Oct 1907 to Present) - Ranked by Flow
1997
93,000
18.54
Jan 02, 1997
2023
67,900
16.83
Dec 31, 2022
2017
49,700
15.19
Feb 10, 2017
1986
45,100
14.76
Feb 17, 1986
1956
42,000
14.59
Dec 23, 1955
1963
39,400
14.11
Feb 01, 1963
1965
37,500
13.80
Dec 23, 1964
1982
37,000
13.70
Feb 16, 1982
Location Photographs
ESRI™ Locator Map
Flood Impacts
13.2 FeetWater floods houses in Wilton. The south bank levee near Wilton is overtopped.
12.0 FeetWater flows on to the road near Wilton.
8.0 FeetLow lying lands along the river begin to flood.
Official 7 Day National Weather Service Forecast   (CAZ017)
Tonight: Clear. Patchy fog late in the night. Lows 44 to 52. Light winds.

Friday: Patchy fog in the morning. Mostly sunny. Highs around 72. Light winds.

Friday Night: Clear. Lows 47 to 55. Light winds.

Saturday: Sunny. Highs 72 to 78. Light winds.

Saturday Night: Clear. Lows 49 to 57. Light winds.

Sunday: Sunny. Highs 73 to 79.

Sunday Night: Clear. Lows 49 to 57.

Monday through Tuesday: Clear. Highs 73 to 79. Lows 48 to 57.

Tuesday Night through Thursday: Mostly clear. Lows 48 to 56. Highs 70 to 79.
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.