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:

Aug 16 2018 at 8:11 AM PDT

Next Issuance:

Aug 17 2018 at 9:00 AM PDT

Monitor Stage: 16.0 Feet

Flood Stage: 18.0 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
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
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ506)

Rest of Today: Sunny. Highs in the mid 70s to upper 80s. Southwest winds 10 to 20 mph.

Tonight: Mostly clear in the evening then becoming partly cloudy. 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 mid 70s to lower 90s. Southwest winds 10 to 20 mph.

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

Saturday: Partly cloudy in the morning then becoming sunny. Highs in the upper 70s to lower 90s. South winds 5 to 10 mph and Becoming southwest 10 to 20 mph in the afternoon.

Saturday Night: Mostly clear in the evening then becoming partly cloudy. Lows in the upper 40s to lower 60s.

Sunday through Wednesday: Mostly clear. Highs in the mid 70s to lower 90s. Lows in the upper 40s to lower 60s.

Impacts - E19 Information
16.0 Feet	Monitor Stage. WFO Monterey/San Francisco Bay Area may issue a Flood Watch to cover Napa Valley region flood potential at this stage.
18.0 Feet	Flood 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 Feet	Moderate 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 Feet	Major flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
24.0 Feet	Disastrous 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.

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Verification - Historical Graphical RVF
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