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 05 2023 at 1:20 PM PST

Next Issuance:

Dec 06 2023 at 9:00 AM PST

Monitor Stage: 60.9 Feet

Flood Stage: 70.1 Feet

Danger Stage: 71.1 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 CA DWR Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2022	0****	--	--
2021	0****	--	--
2020	0****	--	--
2019	44,300	68.74	Feb 16, 2019
2018	5,430	64.80	Apr 8, 2018
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
60.9 Feet	Colusa Weir crest elevation. Overflow begins into the Sutter Bypass.
73.9 Feet	Stages above 73.9 feet result in major flooding. Top of levee.

Official 7 Day National Weather Service Forecast (CAZ016)

Tonight: Partly cloudy. Lows 41 to 49. Light winds.

Wednesday: Rain showers in the afternoon. Highs around 58. Southeast winds up to 20 mph. Gusts up to 20 mph increasing to 30 mph in the afternoon.

Wednesday Night: Mostly cloudy. Rain showers likely in the evening, then a chance of rain showers after midnight. Lows 40 to 48. South winds 10 to 15 mph. Gusts up to 30 mph in the evening.

Thursday: Rain showers. Highs 53 to 59. South winds up to 15 mph. Gusts up to 25 mph in the afternoon.

Thursday Night: Mostly cloudy with a chance of rain showers in the evening, then mostly clear after midnight. Colder. Lows 33 to 39. Southwest winds 10 to 15 mph shifting to the north after midnight.

Friday: Mostly sunny. Patchy frost. Highs around 55.

Friday Night: Mostly clear. Lows 32 to 39.

Saturday: Mostly cloudy. Areas of frost. Highs around 54.

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

Sunday: Mostly cloudy. Highs around 59.

Sunday Night through Tuesday: Mostly clear. Lows 36 to 45. Highs around 60.

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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