CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SACRAMENTO RIVER - COLUSA WEIR (CLAC1)

Latitude: 39.24º N	Longitude: 121.99º W	Elevation: 62 Feet
Location: Colusa County in California		Bulletin Group: Upper Sacramento		River Group: Upper Sacramento

Issuance Time:

Dec 25 2025 at 1:57 PM PST

Next Issuance:

Dec 25 2025 at 9:00 PM PST

Action/Monitor: 60.9 Feet

Minor Flood: 70.1 Feet

Moderate Flood: 72.9 Feet

Major Flood: 73.9 Feet

Plot Type:

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.

Colusa Weir Location - Sacramento River Channel Stage/Flow (Estimated)

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above.

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View California Department of Water Resources Data for this station location.

Historical Mean Dailiy Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025	44,261	67.99	Feb 07, 2025
2024	34,400	67.27	Feb 21, 2024
2023	26,500	66.60	Mar 16, 2023
2022	0****	--	--
2021	0****	--	--
Historical High Stage/Flow Events (Period of Record - January 1911 to Present) - Ranked by Stage
1940	--	70.60*	Mar 1, 1940
1983	81,500	68.96**	Mar 4, 1983
1997	71,000	68.85	Jan 3, 1997
1958	83,600	68.80***	Feb 21, 1958
1965	77,400	68.50	Jan 7, 1965
1943	--	68.30	Jan 24, 1943
* Peak prior to regulation by Shasta Dam Peak after regulation by Shasta Dam * Peak also occurred on Feb 26th ** No weir flow observed during the entire water year *** Datum changed from USED to NAVD88 on 10/01/2019. The difference is -0.9 ft and must be applied to all data before date to convert to NAVD88

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
73.9 Feet	Stages above 73.9 feet result in major flooding. Top of levee.
60.9 Feet	Colusa Weir crest elevation. Overflow begins into the Sutter Bypass.

Official 7 Day National Weather Service Forecast (CAZ016)

Tonight: Rain showers and a slight chance of thunderstorms in the evening, then a chance of rain after midnight. Breezy. Some thunderstorms may produce heavy rainfall in the evening. Lows 43 to 49. South winds 10 to 25 mph with gusts to around 40 mph.

Friday: A chance of rain in the morning, then rain in the afternoon. Breezy. Highs around 50. Southeast winds 10 to 25 mph with gusts to around 40 mph.

Friday Night: Mostly cloudy. Rain likely in the evening, then a chance of rain after midnight. Lows 39 to 46. Southeast winds 10 to 15 mph. Gusts up to 30 mph decreasing to 20 mph after midnight.

Saturday: Mostly cloudy with a slight chance of rain in the morning, then partly cloudy in the afternoon. Highs around 48. North winds up to 10 mph.

Saturday Night: Mostly clear. Lows 34 to 40. North winds around 10 mph with gusts to around 20 mph.

Sunday: Partly cloudy. Highs around 48.

Sunday Night: Partly cloudy. Lows around 36.

Monday through Tuesday: Partly cloudy. Highs 47 to 54. Lows around 36.

Tuesday Night through Wednesday Night: Mostly clear. Lows around 38. Highs 48 to 54.

New Years Day: Mostly cloudy with a slight chance of rain. Highs around 48.

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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