CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SACRAMENTO RIVER - HAMILTON CITY (HAMC1)

Latitude: 39.75º N	Longitude: 122.00º W	Elevation: 125 Feet
Location: Glenn County in California		Bulletin Group: Upper Sacramento		River Group: Upper Sacramento

Issuance Time:

Dec 26 2025 at 1:22 PM PST

Next Issuance:

Dec 27 2025 at 9:00 AM PST

Action/Monitor: 142.0 Feet

Minor Flood: 147.0 Feet

Moderate Flood: 149.2 Feet

Major Flood: 150.2 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.

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	109,552	147.92	Feb 06, 2025
2024	91,100	145.39	Feb 20, 2024
2023	105,300	146.79	Mar 15, 2023
2022	47,500	137.98	Oct 25, 2021
2021	13,300	130.71	Jan 29, 2021
Historical High Stage/Flow Events (Period of Record - January 1927 to Present) - Ranked by Flow
1986	160,900	150.53	Feb 18, 1986
1970	160,700	150.80	Jan 24, 1970
1983	159,600	150.77	Mar 1, 1983
1997	155,300	150.92	Jan 2, 1997
1995	152,460**	150.65	Jan 10, 1995
1974	147,000	149.50	Jan 17, 1974
* Datum changed from USED to NAVD88 on 10/01/2019. The difference is -0.8 ft and must be applied to all data before date to convert to NAVD88 ** Estimated

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
147.2 Feet	Flood Stage - Overflow begins on the East bank of the river in Butte County, from near Wilson Landing Road to Highway 32.
146.8 Feet	Water at top of Irvine Finch boat ramp.
145.1 Feet	Water inundates Phase 2A restoration area north of Hwy 32 bridge inside of levee; touches toe of levee.
144.0 Feet	County Road 23 in Glenn County closes east of RD 2140 levee as a result of water on roadway.
137.7 Feet	West Sacramento Avenue and River Road north of Big Chico Creek flood 1.5 hours after the Hamilton City gage reaches 137.7-138.0 feet.

Official 7 Day National Weather Service Forecast (CAZ016)

Tonight: Mostly cloudy. A chance of rain until early morning, then a slight chance of rain late in the night. Lows 40 to 47. Southeast winds 10 to 15 mph. Gusts up to 30 mph decreasing to 20 mph after midnight.

Saturday: Mostly cloudy with a slight chance of rain in the morning, then mostly sunny in the afternoon. Highs around 50. Northwest winds up to 10 mph.

Saturday Night: Mostly clear. Lows 34 to 40. Northwest winds around 10 mph with gusts to around 20 mph.

Sunday: Partly cloudy in the morning then clearing. Patchy dense fog in the morning. Highs 46 to 52. North winds around 10 mph with gusts to around 20 mph.

Sunday Night: Partly cloudy. Lows 34 to 40. North winds up to 10 mph.

Monday: Partly cloudy. Highs around 52.

Monday Night: Partly cloudy. Lows around 37.

Tuesday: Partly cloudy. Highs around 51.

Tuesday Night and Wednesday: Mostly clear. Lows around 37. Highs around 51.

Wednesday Night: Mostly cloudy. Lows around 39.

New Years Day through Friday: Mostly cloudy with a chance of rain. Highs around 49. Lows 38 to 44.

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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