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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:

Jul 01, 2025 at 11:46 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)

rest of Today: Sunny. Highs in the lower 70s to mid 80s. Southwest winds 10 to 20 mph.

Tonight: Mostly clear in the evening then becoming mostly cloudy. Areas of fog after midnight. Lows in the 50s. Southwest winds 10 to 20 mph.

Wednesday: Partly cloudy in the morning then becoming sunny. Areas of fog in the morning. Highs in the 70s to 80s. Southwest winds 10 to 20 mph.

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

Thursday: Partly cloudy in the morning then becoming sunny. Highs in the 70s to 80s. West winds 5 to 10 mph increasing to 10 to 20 mph in the afternoon.

Thursday Night: Mostly clear in the evening then becoming partly cloudy. Lows in the upper 40s to mid 50s.

Independence Day through Sunday: Mostly clear. Highs in the lower 70s to mid 80s. Lows in the upper 40s to mid 50s.

Sunday Night: Clear in the evening then becoming partly cloudy. Patchy fog. Lows in the upper 40s to mid 50s.

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

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