National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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NAPA RIVER - SAINT HELENA (SHEC1)
Latitude: 38.51º NLongitude: 122.45º WElevation: 195 Feet
Location: Napa County in CaliforniaBulletin Group: Russian NapaRiver Group: Russian Napa
Issuance Time: Sep 21 2023 at 7:52 AM PDTNext Issuance: Sep 22 2023 at 9:00 AM PDT
Monitor Stage: 16.0 FeetFlood Stage: 18.0 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View USGS Data for this station location.

Verification - Historical Graphical RVF
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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
ESRI™ Locator Map
Impacts - E19 Information
16.0 FeetMonitor Stage. WFO Monterey/San Francisco Bay Area may issue a Flood Watch to cover Napa Valley region flood potential at this stage.
18.0 FeetFlood 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 FeetModerate 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 FeetMajor flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
24.0 FeetDisastrous 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)
Today: Sunny. Highs in the mid 60s to lower 80s. Southwest winds 10 to 20 mph.

Tonight: Clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the 40s to mid 50s. South winds 5 to 15 mph.

Friday: Sunny. Patchy fog in the morning. Highs in the mid 60s to lower 80s. Southeast winds 5 to 10 mph and becoming south 5 to 15 mph in the afternoon.

Friday Night: Mostly clear except patchy fog after midnight. Lows in the upper 40s to mid 50s. West winds 5 to 15 mph.

Saturday: Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid 60s to upper 70s. West winds 5 to 15 mph.

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

Sunday and Sunday Night: Mostly cloudy. Highs in the mid 60s to upper 70s. Lows in the 50s.

Monday and Monday Night: Mostly cloudy. A chance of rain. Highs in the mid 60s to upper 70s. Lows in the 50s to lower 60s.

Tuesday: Partly cloudy in the morning then becoming sunny. A slight chance of rain. Highs in the mid 60s to lower 80s.

Tuesday Night and Wednesday: Mostly clear. Lows in the 40s to upper 50s. Highs in the upper 60s to lower 80s.
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.