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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 - SAINT HELENA (SHEC1)
Latitude: 38.51º NLongitude: 122.45º WElevation: 195 Feet
Location: Napa County in CaliforniaRiver Group: Russian Napa
Issuance Time: Oct 31 2014 at 8:06 AM PDTNext Issuance: Nov 01 2014 at 9:00 AM PDT
Monitor Stage: N/A Flood Stage: 16.0 Feet
Verification - Historical Graphical RVF
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Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2013*
9,690
16.87
Dec 23, 2012
2012*
3,500 10.95 Mar 14, 2012
2011* 7,330 14.99 Mar 20, 2011
2010*
3,740
12.99
Jan 20, 2010
2009*
2,800
11.06
Feb 22, 2009
 Historical High Stage/Flow Events (Period of Record - Jun 2000 to Present)*
2006*
18,300
23.61
Dec 31, 2005
1986
16,900***
18.52
Feb 17, 1986
1997 13,100 17.70 Jan 1, 1997
1956
12,600
15.17
Dec 22, 1955
1963 12,300 15.30 Jan 31, 1963
* Discharge affected by regulation or diversion
** Most recent continuous record back to Jun 2000 with segmented periods back to Oct 1929
*** Flood of record at old gage site
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ506)
Tonight: Showers likely and a slight chance of thunderstorms in the evening and then a chance of showers after midnight. Some thunderstorms may produce small hail in the evening. Lows in the lower 40s to mid 50s. West winds 10 to 20 mph.

Saturday: Mostly cloudy. A chance of showers in the morning and Then a slight chance of showers in the afternoon. Highs in the mid 50s to upper 60s. West winds 10 to 15 mph.

Saturday Night: Partly cloudy in the evening then becoming clear except for fog after midnight. Lows in the upper 30s to lower 50s. Northwest winds 10 to 15 mph.

Sunday: Sunny. Patchy fog in the morning. Highs in the upper 50s to lower 70s. Northwest winds 5 to 15 mph.

Sunday Night: Mostly clear. Lows in the upper 30s to mid 50s. Northwest winds 10 to 15 mph.

Monday: Partly cloudy. Highs in the 60s to lower 70s.

Monday Night through Tuesday Night: Mostly clear. Lows in the lower 40s to mid 50s. Highs in the lower 60s to mid 70s.

Wednesday and Wednesday Night: Mostly clear. Highs in the 60s to upper 70s. Lows in the 40s to 50s.

Thursday and Thursday Night: Mostly clear. A slight chance of rain. Highs in the lower 60s to mid 70s. Lows in the 40s to 50s.

Friday: Sunny. Highs in the lower 60s to mid 70s.
Impacts - E19 Information
16.0 FeetFlood Stage. Minor flooding begins to affect the entire reach including the lowest areas of towns along the reach. Rural areas including many secondary roads affected. Primary roads begin to flood.
18.0 FeetModerate flooding of the lower portions of towns along the entire reach. Crop losses and erosion of land becoming widespread. Most secondary and many primary roads inundated.
19.0 FeetMajor flooding throughout the upper Napa Valley with most roads inundated making travel extremely difficult. Moderate to severe damage to all towns along the reach.
20.0 FeetDisastrous flooding across upper Napa Valley with travel essentially impossible. Extreme damage to all towns along the reach.
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.

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.