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:

Oct 20 2020 at 8:05 AM PDT

Next Issuance:

Oct 21 2020 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
2019*	9,570	19.50	Feb 27, 2019
2018*	3,970	11.31	Mar 22, 2018
2017*	9,340	19.20	Feb 7, 2017
2016*	4,520	13.85	Mar 6, 2016
2015*	5,540	15.63	Dec 11, 2014
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 Tonight: Mostly clear. Lows in the upper 40s to lower 60s. Northwest winds 5 to 10 mph.

Wednesday: Sunny. Highs in the mid 70s to upper 80s. Northwest winds 5 to 10 mph and becoming southwest in the afternoon.

Wednesday Night: Mostly clear. Lows in the mid 40s to lower 60s. West winds 5 to 10 mph and becoming northwest 10 to 20 mph after midnight.

Thursday: Sunny. Highs in the lower 70s to mid 80s. North winds 10 to 20 mph. Gusts up to 35 mph in the morning.

Thursday Night: Mostly clear. Lows in the lower 40s to mid 50s. North winds 10 to 20 mph with gusts to around 35 mph.

Friday: Sunny. Highs in the 60s to 70s.

Friday Night: Mostly clear in the evening then becoming partly cloudy. Lows in the 40s to mid 50s.

Saturday: Partly cloudy. Highs in the upper 50s to lower 70s.

Saturday Night through Tuesday: Mostly clear. Lows in the upper 30s to lower 50s. Highs in the 60s to 70s.

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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