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:

Sep 09 2024 at 7:03 AM PDT

Next Issuance:

Sep 10 2024 at 9:00 AM PDT

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
2023*	7,150	16.71	Jan 9, 2023
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
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
24.0 Feet	Disastrous Flooding. Widespread flooding across upper Napa Valley with travel essentially impossible. The peak water level during the flood of 12/31/2005 measured 23.6 feet.
22.0 Feet	Major Flood Stage. Major flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
20.0 Feet	Moderate Flood Stage. 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 to pass.
18.0 Feet	Minor 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.
16.0 Feet	Monitor Stage. WFO Monterey may issue a Flood Watch-based products to cover Napa Valley regional flood potential at this stage.

Official 7 Day National Weather Service Forecast (CAZ506)

Rest of Tonight: Mostly cloudy. Patchy fog. Lows in the upper 40s to mid 50s. West winds 10 to 15 mph.

Tuesday: Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Highs in the upper 60s to lower 80s. Southwest winds 10 to 15 mph.

Tuesday Night: Mostly clear in the evening then becoming partly cloudy. Lows in the 40s to upper 50s. Southwest winds 5 to 15 mph.

Wednesday: Sunny, breezy. Highs in the lower 70s to mid 80s. West winds 10 to 20 mph increasing to 20 to 30 mph in the afternoon.

Wednesday Night: Mostly clear. Breezy. Lows in the 40s to upper 50s. West winds 20 to 30 mph and becoming northwest 10 to 20 mph after midnight.

Thursday: Sunny. Highs in the 70s to 80s.

Thursday Night and Friday: Mostly clear. Lows in the 40s to upper 50s. Highs in the 70s to 80s.

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

Saturday through Sunday: Mostly clear. Highs in the upper 60s to lower 80s. Lows in the upper 40s to mid 50s.

Sunday Night and Monday: Partly cloudy. A slight chance of drizzle. Lows in the 50s. Highs in the mid 60s to upper 70s.

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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