CNRFC - Hydrology - River Guidance - Graphical RVF

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

Issuance Time:

Nov 24 2020 at 1:22 PM PST

Next Issuance:

Nov 25 2020 at 9:00 AM PST

Monitor Stage: 60.9 Feet

Flood Stage: 70.1 Feet

Danger Stage: 71.1 Feet

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
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: Partly cloudy in the morning then clearing. Highs around 59. Northwest winds up to 15 mph.

Tonight: Mostly clear. Lows 36 to 46. Northwest winds 10 to 15 mph.

Thanksgiving Day: Mostly sunny. Breezy. Highs around 61. North winds 10 to 25 mph.

Thursday Night: Clear. Lows 33 to 43. North winds 10 to 20 mph. Gusts up to 30 mph in the evening.

Friday: Areas of frost in the morning. Sunny. Highs 58 to 64. Northwest winds up to 10 mph with gusts to around 20 mph.

Friday Night: Clear. Lows 32 to 42.

Saturday: Mostly sunny. Highs around 62.

Saturday Night and Sunday: Mostly clear. Lows 33 to 43. Highs around 60.

Sunday Night through Monday Night: Partly cloudy. Lows 33 to 43. Highs around 58.

Tuesday: Mostly sunny. 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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