Napa River near St. Helena
No watches, warnings or advisories are in effect for this area.
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Upstream gauge unavailableWarning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/21/2025 6:00 PM PDTOfficial Forecast (FCST) 06/21/2025 9:21 AM PDTRecord: 23.6 ftCATEGORY STAGE 
Major Flooding 22 ft Moderate Flooding 20 ft Minor Flooding 18 ft Action 16 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely year-round.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 24 - 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 - Major Flood Stage. Major flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
- 20 - 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.
Gauge Location
Recent Crests
| 1. | 16.61 ft | on 03-10-2023 |
| 2. | 16.71 ft | on 01-09-2023 |
| 3. | 16.82 ft | on 10-24-2021 |
| 4. | 19.50 ft | on 02-27-2019 |
| 5. | 11.31 ft | on 03-22-2018 |
Recent Crests
| 1. | 16.61 ft | on 03-10-2023 |
| 2. | 16.71 ft | on 01-09-2023 |
| 3. | 16.82 ft | on 10-24-2021 |
| 4. | 19.50 ft | on 02-27-2019 |
| 5. | 11.31 ft | on 03-22-2018 |
| 6. | 19.20 ft | on 02-07-2017 |
| 7. | 13.85 ft | on 03-06-2016 |
| 8. | 15.63 ft | on 12-11-2014 |
| 9. | 8.77 ft | on 02-09-2014 |
| 10. | 16.87 ft | on 12-23-2012 |
| 11. | 10.95 ft | on 03-14-2012 |
| 12. | 14.99 ft | on 03-20-2011 |
| 13. | 12.99 ft | on 01-20-2010 |
| 14. | 11.06 ft | on 02-22-2009 |
| 15. | 14.08 ft | on 01-01-2008 |
| 16. | 23.61 ft | on 12-31-2005 |
| 17. | 14.92 ft | on 12-29-2003 |
| 18. | 16.47 ft | on 12-16-2002 |
| 19. | 16.60 ft | on 02-21-1998 |
| 20. | 14.10 ft | on 01-26-1997 |
| 21. | 13.60 ft | on 01-25-1997 |
| 22. | 17.00 ft | on 01-22-1997 |
| 23. | 17.70 ft | on 01-01-1997 |
| 24. | 14.46 ft | on 02-04-1996 |
| 25. | 15.05 ft | on 01-14-1995 |
| 26. | 17.47 ft | on 01-09-1995 |
| 27. | 16.67 ft | on 01-20-1993 |
| 28. | 14.26 ft | on 03-04-1991 |
| 29. | 14.08 ft | on 02-08-1985 |
| 30. | 15.46 ft | on 12-25-1983 |
| 31. | 16.79 ft | on 03-13-1983 |
| 32. | 16.30 ft | on 12-19-1981 |
| 33. | 14.00 ft | on 02-17-1980 |
| 34. | 16.19 ft | on 01-16-1978 |
| 35. | 13.10 ft | on 03-21-1975 |
| 36. | 11.53 ft | on 03-30-1974 |
| 37. | 15.10 ft | on 01-16-1973 |
| 38. | 14.00 ft | on 12-03-1970 |
| 39. | 13.81 ft | on 01-24-1970 |
| 40. | 11.45 ft | on 01-13-1969 |
| 41. | 15.01 ft | on 01-21-1967 |
| 42. | 13.13 ft | on 01-05-1966 |
| 43. | 14.96 ft | on 01-05-1965 |
| 44. | 15.30 ft | on 01-31-1963 |
| 45. | 11.60 ft | on 02-13-1962 |
| 46. | 14.48 ft | on 02-08-1960 |
| 47. | 13.43 ft | on 02-24-1958 |
| 48. | 15.17 ft | on 12-22-1955 |
| 49. | 11.75 ft | on 01-17-1954 |
| 50. | 12.47 ft | on 12-07-1952 |
| 51. | 11.90 ft | on 12-03-1950 |
| 52. | 11.43 ft | on 01-21-1943 |
| 53. | 11.64 ft | on 04-04-1941 |
| 54. | 14.50 ft | on 02-27-1940 |
Historic Crests
| 1. | 23.61 ft | on 12-31-2005 |
| 2. | 19.50 ft | on 02-27-2019 |
| 3. | 19.20 ft | on 02-07-2017 |
| 4. | 17.70 ft | on 01-01-1997 |
| 5. | 17.47 ft | on 01-09-1995 |
Historic Crests
| 1. | 23.61 ft | on 12-31-2005 |
| 2. | 19.50 ft | on 02-27-2019 |
| 3. | 19.20 ft | on 02-07-2017 |
| 4. | 17.70 ft | on 01-01-1997 |
| 5. | 17.47 ft | on 01-09-1995 |
| 6. | 17.00 ft | on 01-22-1997 |
| 7. | 16.87 ft | on 12-23-2012 |
| 8. | 16.82 ft | on 10-24-2021 |
| 9. | 16.79 ft | on 03-13-1983 |
| 10. | 16.71 ft | on 01-09-2023 |
| 11. | 16.67 ft | on 01-20-1993 |
| 12. | 16.61 ft | on 03-10-2023 |
| 13. | 16.60 ft | on 02-21-1998 |
| 14. | 16.47 ft | on 12-16-2002 |
| 15. | 16.30 ft | on 12-19-1981 |
| 16. | 16.19 ft | on 01-16-1978 |
| 17. | 15.63 ft | on 12-11-2014 |
| 18. | 15.46 ft | on 12-25-1983 |
| 19. | 15.30 ft | on 01-31-1963 |
| 20. | 15.17 ft | on 12-22-1955 |
| 21. | 15.10 ft | on 01-16-1973 |
| 22. | 15.05 ft | on 01-14-1995 |
| 23. | 15.01 ft | on 01-21-1967 |
| 24. | 14.99 ft | on 03-20-2011 |
| 25. | 14.96 ft | on 01-05-1965 |
| 26. | 14.92 ft | on 12-29-2003 |
| 27. | 14.50 ft | on 02-27-1940 |
| 28. | 14.48 ft | on 02-08-1960 |
| 29. | 14.46 ft | on 02-04-1996 |
| 30. | 14.26 ft | on 03-04-1991 |
| 31. | 14.10 ft | on 01-26-1997 |
| 32. | 14.08 ft | on 02-08-1985 |
| 33. | 14.08 ft | on 01-01-2008 |
| 34. | 14.00 ft | on 12-03-1970 |
| 35. | 14.00 ft | on 02-17-1980 |
| 36. | 13.85 ft | on 03-06-2016 |
| 37. | 13.81 ft | on 01-24-1970 |
| 38. | 13.60 ft | on 01-25-1997 |
| 39. | 13.43 ft | on 02-24-1958 |
| 40. | 13.13 ft | on 01-05-1966 |
| 41. | 13.10 ft | on 03-21-1975 |
| 42. | 12.99 ft | on 01-20-2010 |
| 43. | 12.47 ft | on 12-07-1952 |
| 44. | 11.90 ft | on 12-03-1950 |
| 45. | 11.75 ft | on 01-17-1954 |
| 46. | 11.64 ft | on 04-04-1941 |
| 47. | 11.60 ft | on 02-13-1962 |
| 48. | 11.53 ft | on 03-30-1974 |
| 49. | 11.45 ft | on 01-13-1969 |
| 50. | 11.43 ft | on 01-21-1943 |
| 51. | 11.31 ft | on 03-22-2018 |
| 52. | 11.06 ft | on 02-22-2009 |
| 53. | 10.95 ft | on 03-14-2012 |
| 54. | 8.77 ft | on 02-09-2014 |
Collaborative Agencies
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
Resources
Hydrologic Resource Links
Additional Resource Links
WFO Information
Weather Forecast Office
San Francisco Bay Area
21 Grace Hopper Ave, Stop 5
Monterey, CA 93943-5505
Official Homepage