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:

Jul 01 2025 at 7:21 AM PDT

Next Issuance:

Jul 02 2025 at 9:00 AM PDT

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
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024*	3,940	78.05	Feb 21, 2024
2023*	4,380	78.18	Mar 16, 2023
2022*	0****	--	--
2021*	0****	--	--
2020*	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
1958*	44,200	84.62***	Feb 26, 1958
1983*	35,300	83.71	Mar 3, 1983
1956*	29,900	83.15	Jan 16, 1956
* 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: Clear. Lows 62 to 70. South winds up to 10 mph in the evening becoming light.

Wednesday: Sunny. Highs around 98. South winds up to 10 mph.

Wednesday Night: Clear. Lows 63 to 69. South winds up to 10 mph.

Thursday: Mostly sunny. Highs around 92. Southeast winds up to 10 mph.

Thursday Night: Mostly clear. Lows 58 to 64. South winds up to 15 mph.

Independence Day: Sunny. Highs around 88.

Friday Night: Clear. Lows 56 to 62.

Saturday through Tuesday: Clear. Highs around 93. Lows 56 to 66.

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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