CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

MATTOLE RIVER - PETROLIA (MTOC1)

Latitude: 40.31º N	Longitude: 124.28º W	Elevation: 40 Feet
Location: Humboldt County in California		Bulletin Group: North Coast		River Group: North Coast

Issuance Time:

Dec 26 2025 at 1:21 PM PST

Next Issuance:

Dec 27 2025 at 9:00 AM PST

Action/Monitor: N/A

Minor Flood: N/A

Moderate Flood: N/A

Major Flood: N/A

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 US Geological Survey (USGS). View US Geological Survey (USGS) Data for this station location.

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ104)

Tonight: Mostly cloudy until late tonight then becoming partly cloudy. Chance of rain showers in the evening. Snow level 3000 to 3500 feet. Lows 34 to 44. North wind 10 to 20 mph.

Saturday: Sunny. Highs 43 to 53. North wind 10 to 20 mph.

Saturday Night: Partly cloudy in the evening then becoming mostly cloudy. Lows 33 to 43. North wind 5 to 15 mph.

Sunday: Mostly sunny. Highs 50 to 60. North wind around 10 mph.

Sunday Night and Monday: Mostly clear. Lows 35 to 45. Highs 50 to 62. Northeast wind around 5 mph.

Monday Night through Wednesday: Mostly clear. Lows 37 to 47. Highs 52 to 64.

Wednesday Night: Partly cloudy in the evening then becoming mostly cloudy. Slight chance of rain. Lows 39 to 49.

New Years Day: Mostly cloudy. Chance of rain. Highs 49 to 59.

Thursday Night and Friday: Rain likely. Lows 40 to 50. Highs 47 to 59.

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 Eureka 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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To view other verification locations, use our Historical Graphical River Forecast Interface.