On June 20, 2023, the datum was changed from USED to NAVD88 (+2.46 feet). As a result the monitor stage was updated to 38.5 ft and flood stage was updated to 44.5 ft.
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.
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
Most Recent 5 Years
2020*
6,052
37.90
Mar 19, 2025
2024*
13,400
42.98
Mar 2, 2024
2023*
73,600***
46.64***
Jan 1, 2023
2022*
7,790
38.99
Dec 24, 2021
2021*
3,000
32.00
Jan 29, 2021
Historical High Stage/Flow Events (Period of Record - Jan 1952 to Present)**** - Ranked by Flow
2023*
73,600***
46.64***
Jan 1, 2023
1956*
54,000
46.26
Dec 23, 1955
2006*
36,209
47.02
Jan 01, 2006
1958
32,600
46.10
Apr 03, 1958
1965*
32,200
45.35
Dec 23, 1964
1983*
31,000
45.97
Mar 14, 1983
* 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.
**** Additional high flow events occurred in 1986, 1997, & 1998 with only stage measured. Ranking by stage is not possible due to the dynamic nature of the channel.
At 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 Feet
Flood stage.
41.5 Feet
The Cosumnes River overflow channel begins to flow.
38.5 Feet
Monitor Stage.
Official 7 Day National Weather Service Forecast (CAZ017)
Today: Partly cloudy in the morning then becoming mostly cloudy. Patchy fog until late afternoon. Highs around 51. North winds up to 10 mph with gusts to around 20 mph.
Tonight: Partly cloudy. Patchy fog after midnight. Lows around 37. Northwest winds up to 10 mph with gusts to around 20 mph.
Sunday: Mostly cloudy in the morning then clearing. Patchy fog in the morning. Highs around 48. North winds up to 10 mph with gusts to around 20 mph.
Sunday Night: Partly cloudy. Lows 34 to 40. North winds up to 10 mph.
Monday: Mostly cloudy in the morning then becoming partly cloudy. Highs 47 to 52. North winds up to 10 mph.
Monday Night: Partly cloudy. Lows around 37.
Tuesday: Mostly cloudy. Highs around 51.
Tuesday Night: Mostly clear. Lows around 38.
Wednesday: Partly cloudy. Highs around 51.
Wednesday Night: Partly cloudy with a slight chance of rain. Lows around 42.
New Years Day and Thursday Night: Mostly cloudy with a chance of rain. Highs around 49. Lows around 43.
Friday: Cloudy with a chance of rain. Highs around 49.
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.
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