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		River Group: Russian Napa

Monitor Stage: 22.0 Feet

Flood Stage: 25.0 Feet

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
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
2018*	4,580	16.74	Mar 22, 2018
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

Official 7 Day National Weather Service Forecast (CAZ506)

Rest of Tonight: Partly cloudy late in the evening then becoming mostly clear. Patchy fog after midnight. Lows in the mid 30s to upper 40s. Northwest winds up to 5 mph.

Monday: Partly cloudy in the morning then becoming sunny. Patchy dense fog in the morning. Highs in the upper 50s to mid 60s. Northwest winds 5 to 10 mph.

Monday Night: Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the 30s to upper 40s. Northwest winds 5 to 10 mph.

Tuesday: Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the 50s to upper 60s. North winds up to 5 mph and becoming northwest in the afternoon.

Tuesday Night: Mostly clear in the evening then becoming mostly cloudy. Lows in the 30s to mid 40s. North winds up to 5 mph.

Wednesday: Mostly cloudy in the morning then becoming partly cloudy. Patchy dense fog. Highs in the upper 50s to mid 60s.

Wednesday Night through Friday Night: Mostly cloudy. Lows in the mid 30s to upper 40s. Highs in the 50s to mid 60s.

Saturday: Partly cloudy in the morning then becoming sunny. Highs in the 50s to upper 60s.

Saturday Night: Partly cloudy in the evening then becoming mostly cloudy. A slight chance of rain. Lows in the 30s to upper 40s.

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

Impacts - E19 Information
20.0 Feet	Erosion of lowest agricultural areas along river begins.
22.0 Feet	In the city of Napa, the Napa River Dry Bypass is fully inundated and flow begins to cross McKinstry Street.
24.0 Feet	In the city of Napa, flow begins to leave the Napa River channel at RiverPointe (North of Lincoln Avenue).
25.0 Feet	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.
26.0 Feet	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.
27.0 Feet	In the city of Napa, moderate flooding begins on the east side of Napa River near Milliken Creek Inn.
28.0 Feet	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 Napa. Inundation of agricultural land, major damage from bank erosion and sediment deposition in Napa Valley. Transporation 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.
29.0 Feet	In the city of Napa, the Soscol Corridor between the Bypass and LakePark is inundated, and the LakePark area begins to flood and flow begins to leave the Napa River at Riverside Drive.
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 possible flooded in the Napa Valley. Between 5,000 and 7,000 evacuations occurred in the 2/18/1986 record flood, 37,000 cfs and 30.20 feet.
32.0 Feet	Widespread flooding occurs in the entire Napa Valley, with transportation impossible. Disastrous damage to homes and businesses in the Napa Valley, especially the city of Napa.

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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