Napa River near St. Helena, CA
River level and flood forecast · Napa County
The river is 17.5 ft below flood stage (18 ft).
Forecast to rise to 1.1 ft Mon 11 PM, below the 18 ft flood stage.
Flow: 0 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 7:33 AM. Forecasts change as rain falls and as upstream water arrives.
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An email when the National Weather Service forecasts Napa River near St. Helena to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 22 ft |
| Moderate flood stage | 20 ft |
| Flood stage | 18 ft |
| Action stage | 16 ft |
| Record crest (December 31, 2005) | 23.61 ft |
What floods at each level
From the National Weather Service, highest first.
- 24 ftDisastrous Flooding. Widespread flooding across upper Napa Valley with travel essentially impossible.
- 23.61 ftFLOOD OF RECORD. 12/31/2005 measured 23.61 ft. 18,300 cfs 07:45 PT
- 23.6 ftThe peak water level during the flood of 12/31/2005 measured 23.6 feet.
- 22 ftMajor Flood Stage. Major flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
- 20 ftModerate 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 ftMinor 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 ftAction Stage. WFO Monterey may issue a Flood Watch-based products to cover Napa Valley regional flood potential at this stage.
Highest crests on record
- 23.61 ft — December 31, 2005
- 19.5 ft — February 27, 2019
- 19.2 ft — February 7, 2017
- 17.7 ft — January 1, 1997
- 17.47 ft — January 9, 1995
Recent crests: 16.61 ft (March 10, 2023) · 16.71 ft (January 9, 2023) · 16.82 ft (October 24, 2021) · 19.5 ft (February 27, 2019) · 11.31 ft (March 22, 2018)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (SHEC1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.