CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

NAPA RIVER - SAINT HELENA (SHEC1)

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

Issuance Time:

Dec 09 2023 at 8:41 AM PST

Next Issuance:

Dec 10 2023 at 9:00 AM PST

Monitor Stage: 16.0 Feet

Flood Stage: 18.0 Feet

Plot Type:

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

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
2022*	7,560	16.82	Oct 24, 2021
2021*	178	2.26	Jan 27, 2021
2020*	696	4.31	Dec 7, 2019
2019*	9,570	19.50	Feb 27, 2019
2018*	3,970	11.31	Mar 22, 2018
Historical High Stage/Flow Events (Period of Record - Jun 2000 to Present)* - Ranked by Flow
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

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.

Official 7 Day National Weather Service Forecast (CAZ506)

Rest of Today: Partly cloudy late in the morning then becoming sunny. Highs in the mid 50s to lower 60s. East winds up to 5 mph and becoming south in the afternoon.

Tonight: Partly cloudy. Areas of frost after midnight. Lows in the upper 20s to mid 40s. North winds up to 5 mph.

Sunday: Partly cloudy in the morning then becoming mostly cloudy. Patchy dense fog in the morning. Highs in the mid 50s to lower 60s. Northeast winds up to 5 mph and becoming southwest around 5 mph in the afternoon.

Sunday Night: Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 30s to upper 40s. Northwest winds up to 5 mph.

Monday: Mostly cloudy in the morning then becoming sunny. Patchy dense fog in the morning. Highs in the 50s to upper 60s. North winds up to 5 mph and becoming west in the afternoon.

Monday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows in the 30s to upper 40s.

Tuesday and Tuesday Night: Mostly clear. Highs in the 50s to upper 60s. Lows in the upper 30s to mid 40s.

Wednesday: Partly cloudy. Highs in the 50s to mid 60s.

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

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

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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