CNRFC Ensemble Plot for APCC1

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NAPA RIVER - NAPA (APCC1)

Latitude:
38.37º N

Longitude:
122.30º W

Elevation:
25 Feet

Location: Napa County in CA

River Group: Russian Napa

Issuance Time:

Apr 07 2026 at 2:19 PM PDT

Action/
Monitor:
22.0 Ft

Minor
Flood:
25.0 Ft

Moderate
Flood:
26.0 Ft

Major
Flood:
28.0 Ft

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 | APCC1

Cursor readout:

Show:

		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
<-- Previous Forecast	Forecast Date: Forecast Cycle:

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
32.0 Feet	Disastrous flooding. Widespread flooding occurs in the entire Napa Valley, with transportation impossible. Disastrous damage to homes and businesses in the Napa Valley, especially in the City of Napa.
30.0 Feet	In the City of Napa, flooding in the south oxbow area expands south towards Tulocay Creek and Imola Avenue begins to flood on both sides of the river. Major flooding continues in the Napa Valley, with major damage to homes and businesses, especially in Napa. Transportation impossible in the Napa Valley. 20,000 acres possibly flooded in the Napa Valley. Between 5,000 and 7,000 evacuations occurred in the 2/18/86 record flood, 37,000 cfs, 30.20 feet.
29.0 Feet	In the City of Napa, the Soscol corridor between the bypass and Lakepark in inundated, and the Lakepark area begins to flood and flow begins to leave the Napa River at Riverside Drive.
28.0 Feet	Major flooding. In the City of Napa, significant flooding occurs near Lincoln Avenue with some secondary roads inundated. Major flooding of towns within the reach of the gage, especially in Napa. Inundation of agricultural land and major damage from bank erosion and sediment deposition in Napa Valley. Transportation difficult throughout the Napa Valley. The 1/1/1997 flood measured 28.07 feet and cut off east-west travel except at Highway 29 over the Napa River.
27.0 Feet	In the City of Napa, moderate flooding begins on the east side of Napa River near Milliken Creek Inn.
26.0 Feet	Moderate flooding. In the City of Napa, flow begins to leave the Napa River channel in the South Coombs area (north of Imola Avenue) and the south oxbow (near Taylor Street). Crop losses and erosion damage become serious. Moderate flood damage in lower parts of urban areas along the reach. Transportation in the Napa Valley becoming difficult. The flood of 2/3/1998 measured 26.72 feet.
25.0 Feet	Flood Stage. Flooding of lowest parts of towns in reach begins. Inundation of lowest agricultural land in Napa Valley. Some secondary roads are inundated. Moderate damage from bank erosion and sediment deposition throughout the reach.
24.0 Feet	In the City of Napa, flow begins to leave the Napa River channel at Riverpointe (north of Lincoln Avenue).
22.0 Feet	Monitor Stage. In the City of Napa, the Napa River Dry Bypass is fully inundated and flow begins to cross McKinstry Street.
20.0 Feet	Erosion of lowest agricultural areas along river begins.

Flood Impacts
32.0 Feet	Disastrous flooding. Widespread flooding occurs in the entire Napa Valley, with transportation impossible. Disastrous damage to homes and businesses in the Napa Valley, especially in the City of Napa.
30.0 Feet	In the City of Napa, flooding in the south oxbow area expands south towards Tulocay Creek and Imola Avenue begins to flood on both sides of the river. Major flooding continues in the Napa Valley, with major damage to homes and businesses, especially in Napa. Transportation impossible in the Napa Valley. 20,000 acres possibly flooded in the Napa Valley. Between 5,000 and 7,000 evacuations occurred in the 2/18/86 record flood, 37,000 cfs, 30.20 feet.
29.0 Feet	In the City of Napa, the Soscol corridor between the bypass and Lakepark in inundated, and the Lakepark area begins to flood and flow begins to leave the Napa River at Riverside Drive.
28.0 Feet	Major flooding. In the City of Napa, significant flooding occurs near Lincoln Avenue with some secondary roads inundated. Major flooding of towns within the reach of the gage, especially in Napa. Inundation of agricultural land and major damage from bank erosion and sediment deposition in Napa Valley. Transportation difficult throughout the Napa Valley. The 1/1/1997 flood measured 28.07 feet and cut off east-west travel except at Highway 29 over the Napa River.
27.0 Feet	In the City of Napa, moderate flooding begins on the east side of Napa River near Milliken Creek Inn.
26.0 Feet	Moderate flooding. In the City of Napa, flow begins to leave the Napa River channel in the South Coombs area (north of Imola Avenue) and the south oxbow (near Taylor Street). Crop losses and erosion damage become serious. Moderate flood damage in lower parts of urban areas along the reach. Transportation in the Napa Valley becoming difficult. The flood of 2/3/1998 measured 26.72 feet.
25.0 Feet	Flood Stage. Flooding of lowest parts of towns in reach begins. Inundation of lowest agricultural land in Napa Valley. Some secondary roads are inundated. Moderate damage from bank erosion and sediment deposition throughout the reach.
24.0 Feet	In the City of Napa, flow begins to leave the Napa River channel at Riverpointe (north of Lincoln Avenue).
22.0 Feet	Monitor Stage. In the City of Napa, the Napa River Dry Bypass is fully inundated and flow begins to cross McKinstry Street.
20.0 Feet	Erosion of lowest agricultural areas along river begins.