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: Sep 28 2016 at 7:39 AM PDTNext Issuance: Sep 29 2016 at 9:00 AM PDT
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
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
2011*
11,800
22.86
Mar 20, 2011
 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: Partly cloudy. Patchy fog after midnight. Lows in the mid 40s to upper 50s. Southwest winds 10 to 20 mph with gusts to around 35 mph.

Thursday: Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid 60s to lower 80s. Southwest winds 10 to 20 mph.

Thursday Night: Mostly clear in the evening then becoming partly cloudy. Lows in the 40s to mid 50s. Southwest winds 10 to 20 mph.

Friday: Partly cloudy in the morning then becoming sunny. Highs in the 60s to 70s. West winds 10 to 20 mph.

Friday Night: Clear in the evening then becoming mostly cloudy. Breezy. Lows in the lower 40s to mid 50s. West winds 20 to 30 mph decreasing to 10 to 20 mph after midnight.

Saturday: Mostly cloudy in the morning then becoming sunny. Highs in the 60s to 70s.

Saturday Night: Mostly clear in the evening then becoming mostly cloudy. Lows in the lower 40s to mid 50s.

Sunday: Rain likely. Highs in the lower 60s to mid 70s.

Sunday Night through Monday Night: Mostly cloudy. A chance of rain. Lows in the lower 40s to mid 50s. Highs in the 60s to 70s.

Tuesday: Mostly cloudy. A slight chance of rain. Highs in the upper 60s to mid 80s.

Tuesday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows in the 40s to 50s.

Wednesday: Partly cloudy. Highs in the lower 70s to mid 80s.
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.