CNRFC - Hydrology - Observed River/Reservoir Conditions

SACRAMENTO RIVER - COLUSA WEIR (CLAC1)

Latitude: 39.24º N	Longitude: 121.99º W	Elevation: 62 Feet
Location: Colusa County in California		River Group: Upper Sacramento

Monitor Stage: 60.9 Feet

Flood Stage: 70.1 Feet

Danger Stage: 71.1 Feet

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
2019	44,300	68.74	Feb 16, 2019
2018	5,430	64.80	Apr 8, 2018
2017	43,300	68.68	Feb 19, 2017
2016	23,033	67.14	Mar 14, 2016
2015	21,147	66.96	Dec 13, 2014
Historical High Stage/Flow Events (Period of Record - January 1911 to Present)
1940	--	70.60*	Mar 1, 1940
1983	81,500	68.96**	Mar 4, 1983
1997	71,000	68.85	Jan 3, 1997
1958	83,600	68.80***	Feb 21, 1958
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

Official 7 Day National Weather Service Forecast (CAZ016)

Today: Mostly sunny. Highs 85 to 91. South winds up to 15 mph.

Tonight: Clear. Lows 58 to 66. Southeast winds 10 to 15 mph.

Friday: Sunny. Highs 89 to 95. South winds up to 10 mph.

Friday Night: Clear. Lows 61 to 69. Southeast winds up to 10 mph.

Saturday: Sunny. Highs 94 to 100. Light winds becoming south around 10 mph in the afternoon.

Saturday Night: Clear. Lows 62 to 72.

Sunday: Sunny. Highs 96 to 102.

Sunday Night through Tuesday: Clear. Lows 62 to 72. Highs 92 to 102.

Tuesday Night and Wednesday: Clear. Lows 57 to 67. Highs 89 to 97.

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.

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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