National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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NAPA RIVER - NAPA (APCC1)
Latitude: 38.37º NLongitude: 122.30º WElevation: 25 Feet
Location: Napa County in CaliforniaRiver Group: Russian Napa
Monitor Stage: 22.0 FeetFlood Stage: 25.0 Feet

Observed Data Credit
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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
2019*
16,600
26.47
Feb 27, 2019
2018*
4,580
16.74
Mar 22, 2018
2017*
15,900
26.81
Jan 8, 2017
2016*
7,380
19.74
Mar 6, 2016
2015*
10,400
21.97
Dec 11, 2014
 Historical High Stage/Flow Events (Period of Record - Oct 1959 to Present)
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
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ506)
Tonight: Mostly clear. Lows in the lower 40s to mid 50s. Southwest winds 5 to 10 mph and becoming north after midnight.

Sunday: Sunny. Highs in the lower 70s to mid 80s. Northeast winds 5 to 10 mph and becoming south in the afternoon.

Sunday Night: Mostly clear. Lows in the lower 40s to mid 50s. Northwest winds 5 to 10 mph.

Monday: Sunny. Highs in the lower 70s to mid 80s. North winds up to 5 mph and becoming southeast in the afternoon.

Monday Night: Mostly clear. Lows in the lower 40s to mid 50s. Northwest winds 5 to 10 mph.

Tuesday: Mostly cloudy in the morning then becoming sunny. Highs in the upper 60s to lower 80s.

Tuesday Night through Thursday: Mostly clear. Lows in the lower 40s to mid 50s. Highs in the upper 60s to lower 80s.

Thursday Night and Friday: Partly cloudy. Lows in the lower 40s to mid 50s. Highs in the upper 50s to lower 70s.

Friday Night: Partly cloudy. A slight chance of rain. Lows in the upper 30s to lower 50s.

Saturday: Partly cloudy in the morning then becoming sunny. Highs in the mid 50s to lower 70s.
Impacts - E19 Information
20.0 FeetErosion of lowest agricultural areas along river begins.
22.0 FeetIn the city of Napa, the Napa River Dry Bypass is fully inundated and flow begins to cross McKinstry Street.
24.0 FeetIn the city of Napa, flow begins to leave the Napa River channel at RiverPointe (North of Lincoln Avenue).
25.0 FeetFlooding 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 FeetIn 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 FeetIn the city of Napa, moderate flooding begins on the east side of Napa River near Milliken Creek Inn.
28.0 FeetIn 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 FeetIn 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 FeetIn 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 FeetWidespread 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.