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:

Jan 10 2026 at 7:49 AM PST

Next Issuance:

Jan 11 2026 at 9:00 AM 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: Mostly cloudy. Lows 36 to 42. Light winds.

Sunday: Patchy dense fog in the morning. Mostly cloudy. Highs 53 to 59. Light winds.

Sunday Night: Mostly cloudy in the evening then clearing. Patchy fog. Lows 35 to 40. Light winds.

Monday: Partly cloudy in the morning then clearing. Patchy fog and frost in the morning. Highs 51 to 59. Light winds.

Monday Night: Mostly clear. Lows 36 to 43. Light winds.

Tuesday: Mostly sunny. Highs 54 to 62.

Tuesday Night: Mostly clear. Patchy fog. Lows 39 to 45.

Wednesday: Mostly sunny. Highs 55 to 65.

Wednesday Night: Clear. Lows 40 to 48.

Thursday through Saturday: Mostly clear. Highs 58 to 66. Lows 40 to 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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Verification - Historical Graphical RVF
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