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:

Aug 05 2020 at 7:14 AM PDT

Next Issuance:

Aug 06 2020 at 9:00 AM PDT

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)

Tonight: Clear. Lows 54 to 60. Southeast winds 10 to 20 mph.

Thursday: Partly cloudy in the morning then clearing. Highs 84 to 90. South winds around 10 mph.

Thursday Night: Clear. Lows 58 to 66. South winds 10 to 15 mph shifting to the east after midnight.

Friday: Sunny. Highs 89 to 95. North winds up to 10 mph shifting to the southwest around 10 mph in the afternoon.

Friday Night: Clear. Lows 61 to 69. South winds around 10 mph shifting to the east up to 10 mph after midnight.

Saturday: Sunny. Highs 93 to 99.

Saturday Night: Clear. Lows 63 to 71.

Sunday through Monday: Clear. Highs 95 to 102. Lows 62 to 72.

Monday Night: Mostly clear. Lows 60 to 70.

Tuesday through Wednesday: Clear. Highs 89 to 97. Lows 59 to 69.

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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