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

Monitor Stage: N/A

Flood Stage: 16.5 Feet

Historical Info	Peak Discharge	Stage	Date
Period of Record*	18,300 cfs	23.61 feet	Dec 31, 2005
Dec 1996 - Jan 1997	Not Available	18.47 feet	Jan 01
1995	11,100 cfs	18.51 feet	Jan 01
Feb 1986	16,900 cfs	18.52 feet	Feb 17

* Previous Gage Location

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

Regional Location Map		Gage Station Location Map

Official 7 Day National Weather Service Forecast (CAZ506)

Tonight: Clear. Lows in the mid 30s to lower 40s. North winds around 5 mph.

Tuesday: Sunny. Highs in the 60s. Northwest winds up to 5 mph.

Tuesday Night: Mostly clear. Lows near 40. Light winds.

Wednesday: Sunny. Highs in the mid 60s to lower 70s. North winds up to 5 mph.

Wednesday Night: Clear. Lows near 40. Northwest winds around 5 mph in the evening and becoming light.

Thanksgiving Day: Mostly sunny. Highs in the lower to mid 60s.

Thursday Night: Partly cloudy. A chance of rain. Lows in the lower 40s.

Friday: Partly cloudy. Highs around 60.

Friday Night through Monday: Mostly clear. Lows in the upper 30s to mid 40s. Highs near 60.

Impacts - E19 Information
16.5 Feet	Flood Stage. Flooding begins along the entire reach. Flooding of the lowest parts of towns in the reach begins. Minor flooding of rural areas and many secondary roads begins. Some primary roads begin to flood.
18.0 Feet	Moderate flooding of the lower portions of towns along the reach. Crop losses and erosion of land becoming widespread. Most secondary and many primary roads inundated.
19.0 Feet	Major flooding throughout the upper Napa Valley with most roads inundated making travel extremely difficult. Moderate to severe damage to all towns within the reach.
20.0 Feet	Disastrous flooding across the upper Napa Valley with travel nearly impossible. Extreme damage to all towns along the reach.

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.