CNRFC - Hydrology - River Guidance - Graphical RVF

NAPA RIVER - SAINT HELENA (SHEC1)

Latitude: 38.51º N	Longitude: 122.45º W	Elevation: 195 Feet
Location: Napa County in California		River Group: Russian Napa

Issuance Time:

Jul 11 2017 at 7:06 AM PDT

Next Issuance:

Jul 12 2017 at 9:00 AM PDT

Monitor Stage: N/A

Flood Stage: 16.0 Feet

Observed Data Credit
	Raw streamflow data is provided by the US Geological Survey (USGS). View USGS Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2015*	5,540	15.63	Dec 11, 2014
2014*	2,200	8.77	Feb 9, 2014
2013*	9,690	16.87	Dec 23, 2012
2012*	3,500	10.95	Mar 14, 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
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ506)

Tonight: Clear in the evening then becoming partly cloudy. Lows in the upper 40s to lower 60s. South winds 10 to 20 mph.

Wednesday: Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the 70s to 80s. South winds 10 to 20 mph.

Wednesday Night: Clear in the evening then becoming partly cloudy. Lows in the upper 40s to lower 60s. Southwest winds 10 to 20 mph.

Thursday: Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid 70s to upper 80s. Southwest winds 10 to 20 mph.

Thursday Night: Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 40s to lower 60s. Southwest winds 10 to 20 mph.

Friday: Partly cloudy in the morning then becoming sunny. Highs in the upper 70s to lower 90s.

Friday Night through Tuesday: Clear. Lows in the lower 50s to mid 60s. Highs in the upper 70s to mid 90s.

Impacts - E19 Information
16.0 Feet	Flood 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 Feet	Moderate 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 Feet	Major 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 Feet	Disastrous 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.

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