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:

Mar 24 2025 at 8:01 AM PDT

Next Issuance:

Mar 24 2025 at 3:00 PM 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
2023	26,500	66.60	Mar 16, 2023
2022	0****	--	--
2021	0****	--	--
2020	0****	--	--
2019	44,300	68.74	Feb 16, 2019
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)

Today: Sunny. Highs 79 to 84. Light winds.

Tonight: Mostly clear. Lows 53 to 59. Light winds.

Tuesday: Partly cloudy in the morning then clearing. Highs around 83. Light winds.

Tuesday Night: Partly cloudy. Lows around 57. Light winds.

Wednesday: Mostly sunny. Highs 73 to 79. Southeast winds up to 15 mph. Gusts up to 30 mph in the afternoon.

Wednesday Night: Mostly cloudy with a chance of rain showers. Cooler. Lows 47 to 53.

Thursday: Mostly cloudy with a chance of rain showers. Cooler. Highs 61 to 66.

Thursday Night and Friday: Mostly clear. A slight chance of rain showers. Lows around 44. Highs 61 to 67.

Friday Night: Mostly clear. Lows around 43.

Saturday: Mostly cloudy. Highs 61 to 66.

Saturday Night: Mostly cloudy with a chance of rain showers. Lows 45 to 51.

Sunday: Rain showers likely. Highs around 59.

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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