National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SACRAMENTO RIVER - MOULTON WEIR (CLSC1)
Latitude: 39.34º NLongitude: 122.02º WElevation: 76 Feet
Location: Colusa County in CaliforniaBulletin Group: Upper SacramentoRiver Group: Upper Sacramento
Issuance Time: May 18 2025 at 8:21 AM PDTNext Issuance: May 19 2025 at 9:00 AM PDT
Action/Monitor: 76.2 FeetMinor Flood: 83.8 FeetModerate Flood: 87.6 FeetMajor Flood: 88.6 Feet

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

Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.
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
ESRI™ Locator Map
Flood Impacts
88.6 FeetStages above 89.2 feet result in major flooding of areas outside the levees. Top of levee.
76.2 FeetMoulton Weir crest elevation. Overflow begins into butte sink. River Road is flooded and closed.
Official 7 Day National Weather Service Forecast   (CAZ016)
Today: Sunny. Highs 85 to 90. North winds 10 to 15 mph.

Tonight: Clear. Lows 52 to 58. Northwest winds up to 10 mph with gusts to around 20 mph.

Tuesday: Sunny. Highs around 87. Northwest winds up to 10 mph with gusts to around 20 mph.

Tuesday Night: Clear. Lows 55 to 61. North winds up to 10 mph.

Wednesday: Sunny. Highs 89 to 95. Northwest winds around 10 mph with gusts to around 20 mph.

Wednesday Night: Clear. Lows around 59.

Thursday: Sunny. Highs 86 to 91.

Thursday Night and Friday: Clear. Lows around 55. Highs 83 to 91.

Friday Night: Mostly clear. Lows around 55.

Saturday: Sunny. Highs 82 to 87.

Saturday Night and Sunday: Mostly clear. Lows around 56. Highs 82 to 91.
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.