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NAPA RIVER - SAINT HELENA (SHEC1)

Latitude: 38.51º N	Longitude: 122.45º W	Elevation: 195 Feet
Location: Napa County in California		Bulletin Group: Russian Napa		River Group: Russian Napa

Issuance Time:

May 09, 2025 at 9:13 AM PDT

Action/Monitor: 16.0 Feet

Minor Flood: 18.0 Feet

Moderate Flood: 20.0 Feet

Major Flood: 22.0 Feet

Please Note:

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

Short-Range Peak Exceedance Plot Product Info. Plot Type:

CSV Ensemble Files (Data in kcfs): Forecast Group | SHEC1

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		Official Forecast (Deterministic)
		Ensemble Mean
		Model Traces

	Hourly Probabilities
		0-5% chance
		5-25% chance
		25-40% chance
		40-60% chance

What information is considered in this forecast?

Verification / Historical Plots
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Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
24.0 Feet	Disastrous Flooding. Widespread flooding across upper Napa Valley with travel essentially impossible. The peak water level during the flood of 12/31/2005 measured 23.6 feet.
22.0 Feet	Major Flood Stage. Major flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
20.0 Feet	Moderate Flood Stage. Moderate flooding of the lower portions of Silverado Trail along the reach. Inundation of low lying residential areas along the east river bank in the vicinity of Pope Street Bridge. Secondary and many primary roads inundated; most major cross roads inundated and unsafe to pass.
18.0 Feet	Minor Flood Stage. Minor flooding of low lying agricultural areas along river begins. Low lying rural residential areas immediately adjacent to the river and some secondary roads affected.
16.0 Feet	Monitor Stage. WFO Monterey may issue a Flood Watch-based products to cover Napa Valley regional flood potential at this stage.

Official 7 Day National Weather Service Forecast (CAZ506)

Today: Sunny. Highs in the 70s to 80s. Southwest winds 5 to 10 mph.

Tonight: Mostly clear in the evening then becoming partly cloudy. Lows in the 40s to upper 50s. West winds 5 to 10 mph.

Saturday: Partly cloudy in the morning then becoming sunny. Highs in the 70s to 80s. West winds up to 5 mph increasing to 10 to 15 mph in the afternoon.

Saturday Night: Mostly clear. Lows in the lower 50s. West winds 10 to 20 mph.

Sunday: Sunny. Highs in the upper 50s to lower 70s. West winds 10 to 20 mph.

Sunday Night: Mostly clear in the evening then becoming mostly cloudy. A chance of rain. Lows in the mid 40s to lower 50s.

Monday: Mostly cloudy. A chance of rain. Highs in the 50s to mid 60s.

Monday Night and Tuesday: Partly cloudy. Lows in the 40s to lower 50s. Highs in the 60s to lower 70s.

Tuesday Night through Wednesday Night: Mostly clear. Lows in the 40s to lower 50s. Highs in the lower 60s to mid 70s.

Thursday: Partly cloudy in the morning then becoming sunny. Highs in the mid 60s to lower 80s.

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