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:

May 20 2025 at 7:34 AM PDT

Next Issuance:

May 21 2025 at 9:00 AM PDT

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 Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024	34,400	67.27	Feb 21, 2024
2023	26,500	66.60	Mar 16, 2023
2022	0****	--	--
2021	0****	--	--
2020	0****	--	--
Historical High Stage/Flow Events (Period of Record - January 1911 to Present) - Ranked by Flow
1940	--	70.60*	Mar 1, 1940
1958	83,600	68.80***	Feb 21, 1958
1983	81,500	68.96**	Mar 4, 1983
1997	71,000	68.85	Jan 3, 1997
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: Clear. Lows 55 to 61. North winds up to 10 mph.

Wednesday: Sunny. Highs 89 to 94. Northwest winds up to 10 mph.

Wednesday Night: Clear. Lows around 59. South winds up to 10 mph.

Thursday: Sunny. Highs around 86. Southeast winds up to 10 mph.

Thursday Night: Clear. Lows around 54. South winds up to 15 mph.

Friday: Sunny. Highs 79 to 84.

Friday Night: Clear. Lows around 55.

Saturday through Sunday: Clear. Highs 87 to 96. Lows around 57.

Sunday Night through Tuesday: Mostly clear. Lows around 59. Highs 87 to 96.

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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