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 27 2025 at 9:39 AM PST

Next Issuance:

Dec 28 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 Stage/Flow Data
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
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 clear in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows around 37. Northwest winds around 10 mph with gusts to around 20 mph.

Sunday: Mostly sunny. Patchy fog through the day. Highs 48 to 54. North winds up to 10 mph with gusts to around 20 mph.

Sunday Night: Partly cloudy. Patchy fog after midnight. Lows 35 to 41. North winds up to 10 mph.

Monday: Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Highs 49 to 55. North winds up to 10 mph.

Monday Night: Partly cloudy. Patchy fog after midnight. Lows around 37. Light winds.

Tuesday: Partly cloudy. Patchy fog. Highs around 52.

Tuesday Night: Mostly clear. Lows around 38.

Wednesday: Mostly cloudy. Highs 49 to 55.

Wednesday Night: Mostly cloudy with a chance of rain. Lows around 42.

New Years Day: Cloudy with a chance of rain. Highs around 50.

Thursday Night: Rain likely. Lows 41 to 46.

Friday through Saturday: Mostly cloudy with a chance of rain. Highs around 50. Lows 41 to 46.

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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Verification - Historical Graphical RVF
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