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: Dec 15 2017 at 1:05 PM PSTNext Issuance: Dec 16 2017 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)
Tonight: Partly cloudy in the evening then becoming mostly clear. Breezy. Lows in the upper 30s to lower 50s. Northwest winds 10 to 20 mph increasing to 20 to 30 mph with gusts to around 45 mph after midnight.

Saturday: Sunny. Very windy. Highs in the upper 50s to mid 60s. North winds 35 to 45 mph decreasing to 20 to 30 mph in the afternoon.

Saturday Night: Mostly clear. Breezy. Lows in the 30s to upper 40s. North winds 20 to 30 mph.

Sunday: Sunny, breezy. Highs in the 50s to upper 60s. Northwest winds 20 to 30 mph and becoming northeast 10 to 20 mph in the afternoon.

Sunday Night: Mostly clear. Lows in the 30s to 40s. Southeast winds 10 to 20 mph.

Monday: Sunny. Highs in the 50s to upper 60s.

Monday Night and Tuesday: Partly cloudy. Lows in the lower 30s to mid 40s. Highs in the mid 50s to upper 60s.

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

Wednesday: Mostly cloudy. A chance of showers. Highs in the mid 50s to lower 60s.

Wednesday Night and Thursday: Partly cloudy. Lows in the 30s to 40s. Highs in the 50s to mid 60s.

Thursday Night: Mostly clear. Lows in the 30s to 40s.

Friday: Partly cloudy. Highs in the 50s to mid 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.