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)

Tonight: Clear. Lows 55 to 61. Southeast winds up to 15 mph.

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

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

Friday: Sunny. Highs 87 to 92. Northeast winds up to 10 mph shifting to the west around 10 mph in the afternoon.

Friday Night: Clear. Lows around 62. South winds around 10 mph shifting to the southeast after midnight.

Saturday: Sunny. Highs 90 to 96.

Saturday Night: Clear. Lows 62 to 68.

Sunday: Mostly sunny. Highs 92 to 98.

Sunday Night: Partly cloudy. Lows 63 to 69.

Monday: Mostly sunny. Highs 89 to 97.

Monday Night and Tuesday: Partly cloudy with a slight chance of rain showers. Lows 59 to 65. Highs 84 to 94.

Tuesday Night and Wednesday: Mostly cloudy with a slight chance of rain showers. Lows around 59. Highs 80 to 87.

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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