CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SACRAMENTO RIVER - MOULTON WEIR (CLSC1)

Latitude: 39.34º N	Longitude: 122.02º W	Elevation: 76 Feet
Location: Colusa County in California		Bulletin Group: Upper Sacramento		River Group: Upper Sacramento

Issuance Time:

Dec 07 2025 at 7:27 AM PST

Next Issuance:

Dec 08 2025 at 9:00 AM PST

Action/Monitor: 76.2 Feet

Minor Flood: 83.8 Feet

Moderate Flood: 87.6 Feet

Major Flood: 88.6 Feet

Plot Type:

Please Note:
1) Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.

Moulton Weir Location - Sacramento River Channel Stage/Flow (Estimated)

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above.

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View California Department of Water Resources Data for this station location.

Historical Mean Daily Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025*	10,516	79.57	Feb 07, 2025
2024*	3,940	78.05	Feb 21, 2024
2023*	4,380	78.18	Mar 16, 2023
2022*	0****	--	--
2021*	0****	--	--
Historical High Stage/Flow Events (Period of Record - Jan 1931 to Present)** - Ranked by Flow
1942	53,900	83.80***	Feb 7, 1942
1958*	45,300	84.65***	Feb 20, 1958
1940*	45,300	84.69***	Feb 28, 1940
1941*	42,200	84.44***	Feb 12, 1941
1983*	35,300	83.71***	Mar 3, 1983
1938*	33,500	83.52***	Dec 12, 1937
* Discharge affected by regulation or diversion. Peak flow before regulation by Shasta Dam began in 1943 * Old datum. The difference is -2.85 ft and must be applied to data to convert from NGVD29 to NAVD88 ** No weir flow observed during the entire water year *** Datum changed from USED to NAVD88 on 10/01/2019. The difference is -0.6 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

Flood Impacts
88.6 Feet	Stages above 89.2 feet result in major flooding of areas outside the levees. Top of levee.
76.2 Feet	Moulton Weir crest elevation. Overflow begins into butte sink. River Road is flooded and closed.

Official 7 Day National Weather Service Forecast (CAZ016)

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Patchy fog in the late evening and overnight. Lows around 42. Light winds.

Monday: Mostly cloudy in the morning then becoming mostly sunny. Patchy fog in the morning. Highs 49 to 59. Light winds.

Monday Night: Partly cloudy. Lows around 42. Light winds.

Tuesday: Mostly cloudy in the morning then becoming partly cloudy. Highs 55 to 61. Light winds.

Tuesday Night: Partly cloudy. Lows 43 to 48. Light winds.

Wednesday: Partly cloudy. Highs 57 to 67.

Wednesday Night: Mostly clear. Lows 42 to 48.

Thursday: Partly cloudy. Highs 57 to 67.

Thursday Night through Friday Night: Mostly clear. Lows 41 to 47. Highs 58 to 66.

Saturday: Partly cloudy. Highs 57 to 65.

Saturday Night: Mostly clear. Lows 41 to 46.

Sunday: Mostly cloudy. Highs 56 to 62.

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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