CNRFC - Hydrology - River Guidance - Graphical RVF

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

Issuance Time:

Mar 20 2023 at 1:54 PM PDT

Next Issuance:

Mar 21 2023 at 9:00 AM PDT

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
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
2017*	15,900	26.81	Jan 8, 2017
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: Rain likely late in the evening, then rain after midnight. Lows in the 30s to mid 40s. South winds 5 to 10 mph and becoming east 10 to 20 mph after midnight.

Tuesday: Breezy, rain. Highs in the mid 40s to lower 50s. East winds 20 to 30 mph.

Tuesday Night: Rain likely. Lows in the 30s to upper 40s. East winds 10 to 20 mph.

Wednesday: Mostly cloudy. A chance of showers. Highs in the 50s. Northeast winds 5 to 10 mph and becoming northwest in the afternoon. Chance of showers 50 percent.

Wednesday Night: Mostly cloudy. Lows in the 30s to upper 40s. West winds 5 to 15 mph.

Thursday: Mostly cloudy in the morning then becoming partly cloudy. Highs in the mid 50s to lower 60s.

Thursday Night and Friday: Partly cloudy. Lows in the 30s to mid 40s. Highs in the 50s to lower 60s.

Friday Night through Saturday Night: Mostly clear. Lows in the 30s to lower 40s. Highs in the 50s to lower 60s.

Sunday: Partly cloudy. Areas of frost. A slight chance of rain. Highs in the 50s.

Sunday Night and Monday: Mostly cloudy. A chance of rain. Lows in the upper 30s to mid 40s. Highs in the upper 40s to mid 50s.

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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