CNRFC - Hydrology - Observed River/Reservoir Conditions

End of River Group

NAPA RIVER - NAPA (APCC1)

Latitude: 38.37º N	Longitude: 122.30º W	Elevation: 25 Feet
Location: Napa County in California		Bulletin Group: Russian Napa		River Group: Russian Napa

Monitor Stage: 22.0 Feet

Flood Stage: 25.0 Feet

Plot Type:

Observed Data Credit
	Raw streamflow data is provided by the US Geological Survey (USGS). View USGS Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2023*	10,800	22.48	Mar 10, 2023
2022*	8,570	21.43	Oct 24, 2021
2021*	87	4.11	Feb 2, 2021
2020*	820	7.48	Dec 8, 2019
2019*	16,600	26.47	Feb 27, 2019
Historical High Stage/Flow Events (Period of Record - Oct 1959 to Present) - Ranked by Flow
1986*	37,100	30.20	Feb 18, 1986
1995*	32,600	30.50	Mar 09, 1995
2006*	29,600	29.85	Dec 31, 2005
* Discharge affected by regulation or diversion

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Impacts - E19 Information
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.

Official 7 Day National Weather Service Forecast (CAZ506)

Tonight: Mostly clear in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the upper 40s to mid 50s. Southwest winds 10 to 20 mph.

Saturday: Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. A slight chance of drizzle in the morning. Highs in the mid 60s to upper 70s. Southwest winds 10 to 20 mph.

Saturday Night: Mostly clear in the evening then becoming mostly cloudy. Areas of fog after midnight. Lows in the upper 40s to mid 50s. Southwest winds 5 to 15 mph.

Sunday: Mostly cloudy in the morning then becoming sunny. Areas of fog in the morning. Highs in the mid 60s to lower 80s. South winds 5 to 10 mph and becoming southwest 10 to 20 mph in the afternoon.

Sunday Night: Mostly clear in the evening then becoming mostly cloudy. Areas of fog after midnight. Lows in the 40s to upper 50s. Southwest winds 10 to 20 mph and becoming 5 to 10 mph after midnight.

Monday: Mostly cloudy in the morning then becoming sunny. Areas of fog. Highs in the upper 60s to lower 80s.

Monday Night: Mostly clear in the evening then becoming partly cloudy. Lows in the 50s.

Tuesday: Partly cloudy in the morning then becoming sunny. Highs in the lower 70s to mid 80s.

Tuesday Night through Wednesday Night: Mostly clear except patchy fog. Lows in the 50s to lower 60s. Highs in the mid 70s to upper 80s.

Thursday: Partly cloudy in the morning then becoming sunny. Highs in the mid 70s to lower 90s.

Thursday Night: Mostly clear in the evening then becoming partly cloudy. Patchy fog. Lows in the 50s to lower 60s.

Friday: Partly cloudy in the morning then becoming sunny. Highs in the mid 70s to lower 90s.

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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