CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

MARK WEST CREEK - MIRABEL HEIGHTS (MWEC1)

Latitude: 38.49º N	Longitude: 122.85º W	Elevation: 50 Feet
Location: Sonoma County in California		Bulletin Group: Russian Napa		River Group: Russian Napa

Issuance Time:

Dec 25 2025 at 1:11 PM PST

Next Issuance:

Dec 26 2025 at 9:00 AM PST

Action/Monitor: 50.5 Feet

Minor Flood: 55.0 Feet

Moderate Flood: 59.0 Feet

Major Flood: 65.0 Feet

Please Note:

Stage forecasts at this location are uncertain due to backwater effects.

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

Flood Impacts
65.0 Feet	Major Flooding. Major roadway inundation on Trenton-Healdburg Road, Wohler Road in the vicinity of Mark West Creek, and Eastside Road. Trenton-Healdsburg Road bridge over Mark West Creek flooded and/or backwatered. Major flooding of lowest vineyards adjacent to channels, of approximately 5-10 feet deep or more. Lower Windsor Creek also likely flooding.
59.0 Feet	Moderate Flooding. Trenton-Healdsburg Road begins to flood at lowest spots on right bank (north side). Portions of Wohler Road downstream also likely flooded, including Wohler Road Bridge over Mark West Creek. NWS will issue Flash Flood Warning, if not yet already issued.
55.0 Feet	Minor Flooding. More severe flooding occurring on adjacent agricultural lands and access roads. NWS will issue an Urban/Small Stream Advisory, if not yet already issued.
50.5 Feet	Monitor Stage. Low-lying floodplain vineyards and agricultural land on both side of channel, mostly downstream of Trenton-Healdsburg Road, begin to flood.

Official 7 Day National Weather Service Forecast (CAZ506)

rest of Tonight: Mostly cloudy. A chance of showers. Lows in the 40s to lower 50s. South winds 10 to 20 mph with gusts to around 35 mph.

Friday: Mostly cloudy. A chance of showers. A slight chance of thunderstorms in the afternoon. Some thunderstorms may produce heavy rainfall in the afternoon. Highs in the 40s to upper 50s. Southwest winds 10 to 20 mph with gusts to around 35 mph.

Friday Night: Mostly cloudy in the evening then becoming partly cloudy. A slight chance of showers in the evening. Lows in the 30s to upper 40s. West winds 5 to 15 mph.

Saturday: Partly cloudy in the morning then becoming sunny. Highs in the upper 40s to mid 50s. North winds 5 to 10 mph.

Saturday Night: Mostly clear in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the mid 30s to lower 40s. North winds 5 to 10 mph.

Sunday: Partly cloudy in the morning then becoming sunny. Patchy dense fog. Highs in the 40s to mid 50s.

Sunday Night: Mostly clear in the evening then becoming partly cloudy. Patchy frost. Lows in the mid 30s to lower 40s.

Monday through Tuesday Night: Mostly clear. Highs in the upper 40s to lower 60s. Lows in the mid 30s to lower 40s.

Wednesday: Partly cloudy. Highs in the mid 40s to lower 60s.

Wednesday Night: Mostly cloudy. Patchy fog. A slight chance of showers. Lows in the upper 30s to mid 40s.

New Years Day: Cloudy. Patchy fog. A chance of showers. Highs in the upper 40s to mid 50s.

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 San Francisco Bay Area-Monterey 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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