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 31 2023 at 7:58 AM PDT

Next Issuance:

Jun 01 2023 at 9:00 AM PDT

Monitor Stage: 60.9 Feet

Flood Stage: 70.1 Feet

Danger Stage: 71.1 Feet

Plot Type:

Colusa Weir Location - Sacramento River Channel Stage/Flow (Estimated)

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)

Today: Sunny. Highs 83 to 88. Southeast winds up to 10 mph.

Tonight: Clear. Lows 56 to 62. South winds around 10 mph shifting to the east after midnight.

Friday: Sunny. Highs 87 to 92. Northwest winds up to 10 mph.

Friday Night: Clear. Lows around 61. South winds around 10 mph shifting to the northeast after midnight.

Saturday: Sunny. Highs 90 to 96. North winds up to 10 mph shifting to the southwest around 10 mph in the afternoon.

Saturday Night: Clear. Lows around 65.

Sunday: Mostly sunny. Highs 93 to 99.

Sunday Night: Mostly cloudy. Lows around 67.

Monday: Partly cloudy. Highs 87 to 95.

Monday Night: Mostly cloudy with a slight chance of rain showers. Lows 58 to 64.

Tuesday: Partly cloudy with a slight chance of rain showers. Highs 82 to 87.

Tuesday Night: Mostly cloudy with a slight chance of rain showers. Lows around 60.

Wednesday: Partly cloudy with a slight chance of rain showers. Highs 81 to 86.

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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