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: Feb 19 2018 at 8:34 AM PSTNext Issuance: Feb 20 2018 at 9:00 AM PST
Monitor Stage: 16.0 FeetFlood Stage: 18.0 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*
4,520 13.85 Mar 6, 2016
2015*
5,540
15.63
Dec 11, 2014
2014*
2,200
8.77
Feb 9, 2014
2013*
9,690
16.87
Dec 23, 2012
2011* 7,330 14.99 Mar 20, 2011
 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)
Rest of Tonight: Clear. Widespread frost. Lows in the mid 20s to upper 30s. Northwest winds 10 to 20 mph.

Tuesday: Sunny in the morning then becoming partly cloudy. Widespread frost in the morning. Highs in the 40s to mid 50s. West winds 10 to 20 mph.

Tuesday Night: Mostly cloudy. Widespread frost after midnight. Lows in the 20s to upper 30s. Northwest winds 10 to 20 mph and Becoming north 10 to 15 mph after midnight.

Wednesday: Mostly cloudy in the morning then becoming partly cloudy. Widespread frost in the morning. Highs in the upper 40s to mid 50s. Northeast winds 10 to 15 mph and becoming northwest in the afternoon.

Wednesday Night: Mostly cloudy. A slight chance of rain after midnight. Lows in the 30s to lower 40s. West winds 5 to 10 mph and Becoming northwest 10 to 20 mph after midnight. Chance of rain 20 percent.

Thursday: Mostly cloudy. A slight chance of rain. Highs in the 40s to upper 50s.

Thursday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows in the upper 20s to lower 40s.

Friday through Sunday: Partly cloudy. Highs in the 50s to lower 60s. Lows in the upper 20s to mid 40s.

Sunday Night and Monday: Mostly cloudy. A slight chance of showers. Lows in the lower 30s to mid 40s. Highs in the upper 40s to lower 60s.
Impacts - E19 Information
16.0 FeetMonitor Stage. WFO Monterey/San Francisco Bay Area may issue a Flood Watch to cover Napa Valley region flood potential at this stage.
18.0 FeetFlood Stage. Minor flooding of low lying agricultural areas along river begins. Low lying rural residential areas immediately adjacent to the river and some secondary roads affected.
20.0 FeetModerate flooding of the lower portions of Silverado Trail along the reach. Inundation of low lying residential areas along the east river bank in the vicinity of Pope Street Bridge. Secondary and many primary roads inundated. Most major cross roads inundated and unsafe.
22.0 FeetMajor flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
24.0 FeetDisastrous flooding. Widespread flooding across the upper Napa Valley with travel essentially impossible. The peak water level during the flood of 12/31/2005 measured 23.6 feet.
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.