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:

Mar 22 2023 at 2:52 PM PDT

Next Issuance:

Mar 23 2023 at 9:00 AM PDT

Monitor Stage: 16.0 Feet

Flood Stage: 18.0 Feet

Plot Type:

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
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
2017*	9,340	19.20	Feb 7, 2017
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

Official 7 Day National Weather Service Forecast (CAZ506)

Rest of Today: Mostly cloudy. A slight chance of rain. Highs in the 50s to lower 60s. Northeast winds 5 to 10 mph.

Tonight: Mostly cloudy. A slight chance of rain in the evening. Lows in the upper 30s to mid 40s. Northwest winds 10 to 20 mph.

Thursday: Mostly cloudy in the morning then becoming partly cloudy. A slight chance of rain in the afternoon. Highs in the 50s to lower 60s. West winds 10 to 20 mph.

Thursday Night: Mostly cloudy in the evening then becoming mostly clear. Lows in the mid 30s to lower 40s. Northwest winds 10 to 20 mph.

Friday: Mostly cloudy in the morning then becoming partly cloudy. Highs in the 50s. Northwest winds 10 to 20 mph.

Friday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid 30s to lower 40s.

Saturday and Saturday Night: Mostly clear. Breezy. Highs in the 50s to lower 60s. Lows in the 30s to lower 40s.

Sunday: Sunny in the morning then becoming partly cloudy. Areas of frost. Highs in the 50s to lower 60s.

Sunday Night: Partly cloudy in the evening then becoming mostly cloudy. A chance of rain. Lows in the 30s to mid 40s.

Monday and Monday Night: Rain likely. Highs in the 50s. Lows in the upper 30s to mid 40s.

Tuesday: Rain. Highs in the upper 40s to mid 50s.

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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