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
Issuance Time: Feb 23 2018 at 1:31 PM PSTNext Issuance: Feb 24 2018 at 9:00 AM PST
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.

Verification - Historical Graphical RVF
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Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2016*
7,380
19.74
Mar 6, 2016
2015*
10,400
21.97
Dec 11, 2014
2014*
3,070
15.11
Feb 9, 2014
2013*
13,100
23.65
Dec 24, 2012
2012*
5,730
18.27
Mar 14, 2012
 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)
Rest of Tonight: Mostly clear. Areas of frost late in the evening. Widespread frost after midnight. Lows in the upper 20s to lower 40s. West winds 10 to 20 mph.

Saturday: Partly cloudy. Widespread frost in the morning. Highs in the 50s. Northwest winds 10 to 20 mph.

Saturday Night: Partly cloudy in the evening then becoming mostly clear. Areas of frost after midnight. Lows in the 30s to lower 40s. Northwest winds 10 to 20 mph.

Sunday: Sunny in the morning then becoming partly cloudy. Breezy. Areas of frost in the morning. Highs in the 50s to lower 60s. Northwest winds 10 to 20 mph increasing to west 20 to 30 mph in the afternoon.

Sunday Night: Mostly cloudy. Breezy. A chance of showers. Lows in the 30s to mid 40s. West winds 20 to 30 mph decreasing to 10 to 20 mph after midnight. Chance of showers 50 percent.

Monday: Mostly cloudy. A chance of showers. Highs in the upper 40s to mid 50s.

Monday Night: Partly cloudy. Breezy. A slight chance of showers. Lows in the 30s to lower 40s.

Tuesday through Wednesday: Partly cloudy. Highs in the 50s to lower 60s. Lows in the upper 20s to lower 40s.

Wednesday Night: Mostly cloudy. A chance of showers. Lows in the mid 30s to upper 40s.

Thursday: Showers likely. Highs in the 40s to upper 50s.

Thursday Night and Friday: Mostly cloudy. A chance of showers. Lows in the lower 30s to mid 40s. Highs in the mid 40s to upper 50s.
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.