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)

Tonight: Mostly clear. Lows 43 to 53. Southeast winds up to 10 mph shifting to the northeast after midnight.

Sunday: Mostly sunny. Highs 77 to 83. Northwest winds up to 10 mph.

Sunday Night: Mostly clear. Lows 43 to 53. Light winds.

Monday: Mostly sunny. Highs around 81. Northwest winds up to 10 mph.

Monday Night: Mostly clear. Lows 46 to 56. Light winds.

Tuesday: Partly cloudy. Highs around 78.

Tuesday Night: Mostly clear. Lows 44 to 54.

Wednesday through Thursday Night: Mostly clear. Highs 78 to 84. Lows 46 to 56.

Friday and Friday Night: Partly cloudy. Not as warm. Highs around 70. Lows 43 to 53.

Saturday: Partly cloudy. Highs around 61.

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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