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

*** IMPORTANT ***  Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.
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SACRAMENTO RIVER - HAMILTON CITY (HAMC1)
Latitude: 39.75º NLongitude: 122.00º WElevation: 125 Feet
Location: Glenn County in CaliforniaBulletin Group: Upper SacramentoRiver Group: Upper Sacramento
Issuance Time: Jun 05 2025 at 7:55 AM PDTNext Issuance: Jun 06 2025 at 9:00 AM PDT
Action/Monitor: 142.0 FeetMinor Flood: 147.0 FeetModerate Flood: 149.2 FeetMajor Flood: 150.2 Feet

Sacramento River - Hamilton City (HAMC1)River Forecast Plot

Combination chart with 4 data series.
Forecast Posted: 06/05/2025 at 7:34 AM PDT ● Graphic Created: 06/05/2025 at 7:56 AM PDT
The chart has 1 X axis displaying Time. Range: 2025-05-31 14:00:00 to 2025-06-10 14:00:00.
The chart has 2 Y axes displaying Precipitation (In.) and Precipitation (In.).
End of interactive chart.

Chart

Combination chart with 7 data series.
The chart has 1 X axis displaying Observation / Forecast Time (Pacific Local Time). Range: 2025-05-31 07:00:00 to 2025-06-10 07:00:00.
The chart has 2 Y axes displaying Stage (Feet) and Flow (Cubic Feet per Second).
End of interactive chart.
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
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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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Day:  
Year:  
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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
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
ESRI™ Locator Map
Flood Impacts
147.2 FeetOverflow begins on the east bank of the river, from near Wilson Landing Road to Highway 32.
146.8 FeetWater at top of Irvine Finch boat ramp.
145.1 FeetWater inundates Phase 2A restoration area north of Hwy 32 bridge inside of levee; touches toe of levee.
144.0 FeetCounty Road 23 in Glenn County closes east of RD 2140 levee as a result of water on roadway.
137.7 FeetWest 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: Sunny. Highs around 91. Southeast winds up to 10 mph.

Tonight: Clear. Lows 57 to 63. Southeast winds up to 10 mph.

Friday: Sunny. Highs 92 to 98. Light winds becoming south up to 10 mph in the afternoon.

Friday Night: Clear. Lows 61 to 67. South winds up to 10 mph.

Saturday: Sunny. Highs 95 to 100. Southeast winds up to 10 mph.

Saturday Night: Clear. Lows 62 to 68.

Sunday: Sunny. Highs 95 to 101.

Sunday Night through Wednesday: Clear. Lows 59 to 68. Highs 95 to 102.
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.