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 07 2024 at 7:33 AM PST

Next Issuance:

Dec 08 2024 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: 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.

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

Impacts - E19 Information
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: Mostly sunny in the morning then becoming partly cloudy. Widespread fog and locally dense early in the morning. Haze in the morning. Areas of fog late in the morning. Highs around 61. Light winds.

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Lows 40 to 48. Light winds.

Sunday: Partly cloudy in the morning then clearing. Highs around 64. Northwest winds up to 15 mph with gusts to around 25 mph.

Sunday Night: Clear. Lows 36 to 46. North winds 10 to 15 mph. Gusts up to 20 mph increasing to 30 mph after midnight.

Monday: Sunny. Highs around 61. North winds 10 to 15 mph with gusts to around 30 mph.

Monday Night: Clear, colder. Lows 31 to 41.

Tuesday: Partly cloudy. Highs around 57.

Tuesday Night: Mostly cloudy. Lows 35 to 44.

Wednesday: Partly cloudy. Highs around 58.

Wednesday Night: Mostly cloudy with a slight chance of rain showers. Lows 37 to 44.

Thursday through Friday: Mostly cloudy with a chance of rain showers. Highs around 56. Lows 37 to 44.

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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