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:

May 08 2025 at 8:08 AM PDT

Next Issuance:

May 09 2025 at 9:00 AM PDT

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
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
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
2020	28,100	134.20	Jan 27, 2020
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	--	150.65	Jan 10, 1995
* 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

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
147.2 Feet	Overflow begins on the east bank of the river, 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)

Today: Mostly sunny. Highs 89 to 94. Light winds becoming south up to 10 mph in the afternoon.

Tonight: Mostly clear. Lows 56 to 62. Southeast winds up to 10 mph.

Saturday: Mostly sunny. Highs 89 to 95. Light winds becoming south up to 10 mph in the afternoon.

Saturday Night: Mostly clear. Lows 55 to 61. South winds 10 to 15 mph.

Sunday: Mostly sunny. Highs 77 to 83. South winds up to 15 mph. Gusts up to 20 mph increasing to 30 mph in the afternoon.

Sunday Night: Partly cloudy with a slight chance of rain showers. Lows around 51.

Monday: Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Cooler. Highs 63 to 68.

Monday Night: Partly cloudy with a slight chance of rain showers. Lows 45 to 50.

Tuesday: Partly cloudy with a slight chance of rain showers. Highs 67 to 73.

Tuesday Night: Mostly clear. Lows around 50.

Wednesday and Wednesday Night: Clear. Highs 75 to 80. Lows around 51.

Thursday: Mostly sunny. Highs 80 to 85.

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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