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RUSSIAN RIVER - HOPLAND (HOPC1)

Latitude: 39.03º N	Longitude: 123.13º W	Elevation: 498 Feet
Location: Mendocino County in California		Bulletin Group: Russian Napa		River Group: Russian Napa

Issuance Time:

May 09, 2025 at 9:13 AM PDT

Action/Monitor: N/A

Minor Flood: 15.0 Feet

Moderate Flood: 23.0 Feet

Major Flood: 26.0 Feet

Please Note:

Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.

Threshold Exceedance Plot Product Information

CSV Ensemble Files (Data in kcfs): Forecast Group | HOPC1

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		Official Forecast (Deterministic)

		Prob. of Threshold Exceedance
		Model Traces

What information is considered in this forecast?

Verification / Historical Plots
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Flood Impacts
30.0 Feet	Disastrous flooding. Many homes and businesses damaged. Numerous primary and secondary roads and some bridges could be washed out. This is equal to the highest known stage, which occurred in December 1937. 6500 acres were inundated by flood waters.
28.0 Feet	Disastrous flooding will occur. Many homes and businesses could be damaged. Many primary and secondary roads and some bridges could be washed out.
27.0 Feet	Widespread major flooding. At the forecast level, over 500 homes and farm buildings were damaged on December 22, 1955. 6300 acres of land were inundated by flood waters. All persons in the areas area urged to move to high ground and take appropriate action to protect life and property.
26.0 Feet	Widespread major flooding will occur. Primary roads and some bridges will flood.
25.0 Feet	Severe bank erosion is likely with widespread flooding of farmland, buildings, and low-lying homes in the Hopland, Ukiah, and Talmage areas. Many secondary roads will be flooded. This level of flooding caused 6100 acres to flood in February 1940.
24.0 Feet	Flooding of low-lying stuctures and farmland in the Hopland, Ukiah, and Talmage ares. Many secondary roads may also be flooded. Severe bank erosion is possible.
23.0 Feet	Flooding of farmland, buildings, and low-lying homes in the Hopland area. Flooding will begin in the Ukiah and Talmage areas.
21.0 Feet	Flooding of low-lying structures just west of the railroad tracks near Hopland.
20.0 Feet	Flooding of low-lying structures east of the railroad tracks near Hopland.
18.0 Feet	Flooding of Highway 222 near Ukiah. Secondary roads in low-lying areas will be flooded in the Hopland, Ukiah, and Talmage areas.
17.0 Feet	Significant flooding of Highway 175 at the approaches to the Russian River bridge. Minor flooding of Highway 222 near Ukiah, and in crop land along the left and right banks of the Russian River near Hopland.
15.0 Feet	Flooding of Highway 175 is expected at the approaches to the Russian River bridge. Expect flooding of cropland on the right bank of river.

Official 7 Day National Weather Service Forecast (CAZ113)

Today: Mostly sunny. Highs 79 to 94.

Tonight: Partly cloudy. Lows 48 to 58.

Saturday: Partly cloudy in the morning then clearing. Highs 73 to 88.

Saturday Night: Partly cloudy. Lows 42 to 52.

Sunday: Mostly sunny. Highs 57 to 70.

Sunday Night and Monday: Mostly cloudy. Rain likely. Lows 41 to 51. Highs 55 to 70.

Monday Night: Mostly cloudy in the evening then becoming partly cloudy. Slight chance of rain. Lows 39 to 49.

Tuesday: Mostly sunny. Highs 56 to 69.

Tuesday Night and Wednesday: Mostly clear. Lows 39 to 49. Highs 60 to 75.

Wednesday Night and Thursday: Partly cloudy. Lows 41 to 51. Highs 65 to 80.

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