San Joaquin River at Vernalis
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
- Warning: 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) 06/15/2025 12:45 AM PDTOfficial Forecast (FCST) 06/14/2025 7:17 AM PDTRecord: 34.9 ftLow Threshold: 0 ftCATEGORY STAGE 
Major Flooding 37.3 ft Moderate Flooding 32 ft Minor Flooding 29 ft Action 24.5 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
- 37.29 - Stages above 37.3 feet results in flooding outside the levees. Top of levee.
- 29.6 - Homes along east bank of river on Airport Court in Manteca experience flooding.
- 26 - Severe seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises.
Gauge Info
| Coordinates | 37.6760, -121.266 |
| RFC | CNRFC |
| State | CA |
| WFO | STO |
| County | San Joaquin |
| Data Provider(s) | |
| USGS | 11303500 |
| State of California / Department of Water Resources | DWR CDEC ID: VNS |
Gauge Location
Recent Crests
| 1. | 18.12 ft | on 03-06-2024 |
| 2. | 29.83 ft | on 03-19-2023 |
| 3. | 25.70 ft | on 01-18-2023 |
| 4. | 10.83 ft | on 12-29-2021 |
| 5. | 10.76 ft | on 01-31-2021 |
Recent Crests
| 1. | 18.12 ft | on 03-06-2024 | |
| 2. | 29.83 ft | on 03-19-2023 | |
| 3. | 25.70 ft | on 01-18-2023 | |
| 4. | 10.83 ft | on 12-29-2021 | |
| 5. | 10.76 ft | on 01-31-2021 | |
| 6. | 14.29 ft | on 12-09-2019 | |
| 7. | 21.84 ft | on 03-04-2019 | |
| 8. | 17.83 ft | on 04-08-2018 | |
| 9. | 30.72 ft | on 02-23-2017 | |
| 10. | 14.21 ft | on 03-15-2016 | |
| 11. | 9.66 ft | on 04-26-2015 | |
| 12. | 9.66 ft | on 12-14-2014 | |
| 13. | 11.13 ft | on 04-27-2014 | |
| 14. | 12.37 ft | on 05-04-2013 | |
| 15. | 12.95 ft | on 05-14-2012 | |
| 16. | 27.17 ft | on 04-02-2011 | |
| 17. | 12.71 ft | on 01-24-2010 | |
| 18. | 11.02 ft | on 03-06-2009 | |
| 19. | 13.50 ft | on 01-29-2008 | |
| 20. | 29.25 ft | on 04-13-2006 | |
| 21. | 12.06 ft | on 03-02-2006 | |
| 22. | 20.73 ft | on 06-02-2005 | |
| 23. | 13.12 ft | on 01-05-2005 | |
| 24. | 12.20 ft | on 02-27-2004 | |
| 25. | 11.27 ft | on 04-21-2003 | |
| 26. | 13.94 ft | on 01-04-2002 | |
| 27. | 13.49 ft | on 02-26-2001 | |
| 28. | 20.88 ft | on 02-14-1999 | |
| 29. | 28.66 ft | on 02-13-1998 | |
| 30. | 34.88 ft | on 01-05-1997 | |
| 31. | 26.77 ft | on 03-20-1995 | |
| 32. | 11.25 ft | on 02-10-1995 | |
| 33. | 19.49 ft | on 01-29-1995 | |
| 34. | 18.30 ft | on 01-19-1993 | |
| 35. | 10.20 ft | on 05-29-1990 | |
| 36. | 10.90 ft | on 05-03-1989 | |
| 37. | 11.10 ft | on 04-27-1988 | |
| 38. | 11.20 ft | on 03-06-1987 | |
| 39. | 29.80 ft | on 03-18-1986 | |
| 40. | 14.50 ft | on 12-20-1985 | |
| 41. | 29.00 ft | on 01-06-1984 | |
| 42. | 29.12 ft | on 04-18-1982 | |
| 43. | 14.40 ft | on 01-31-1981 | |
| 44. | 20.90 ft | on 03-03-1979 | |
| 45. | 26.90 ft | on 05-04-1978 | |
| 46. | 9.00 ft | on 10-02-1977 | |
| 47. | 14.30 ft | on 10-19-1975 | |
| 48. | 17.40 ft | on 02-15-1975 | |
| 49. | 17.90 ft | on 01-27-1974 | |
| 50. | 20.40 ft | on 02-18-1973 | |
| 51. | 12.50 ft | on 12-30-1971 | |
| 52. | 15.30 ft | on 12-23-1970 | |
| 53. | 34.55 ft | on 01-27-1969 | 1 |
| 54. | 11.00 ft | on 01-29-1968 | 1 |
| 55. | 26.80 ft | on 04-30-1967 | 1 |
| 56. | 17.90 ft | on 12-07-1965 | 1 |
| 57. | 25.50 ft | on 01-12-1965 | 1 |
| 58. | 12.60 ft | on 12-27-1963 | 1 |
| 59. | 20.40 ft | on 05-31-1963 | 1 |
| 60. | 21.83 ft | on 12-25-1955 | |
| 61. | 32.81 ft | on 12-09-1950 | |
| 62. | 30.43 ft | on 04-02-1940 | 1 |
| 63. | 32.71 ft | on 03-16-1938 | 1 |
| 64. | 32.11 ft | on 02-12-1938 | 1 |
Historic Crests
| 1. | 34.88 ft | on 01-05-1997 | |
| 2. | 34.55 ft | on 01-27-1969 | 1 |
| 3. | 32.81 ft | on 12-09-1950 | |
| 4. | 32.71 ft | on 03-16-1938 | 1 |
| 5. | 32.11 ft | on 02-12-1938 | 1 |
Historic Crests
| 1. | 34.88 ft | on 01-05-1997 | |
| 2. | 34.55 ft | on 01-27-1969 | 1 |
| 3. | 32.81 ft | on 12-09-1950 | |
| 4. | 32.71 ft | on 03-16-1938 | 1 |
| 5. | 32.11 ft | on 02-12-1938 | 1 |
| 6. | 30.72 ft | on 02-23-2017 | |
| 7. | 30.43 ft | on 04-02-1940 | 1 |
| 8. | 29.83 ft | on 03-19-2023 | |
| 9. | 29.80 ft | on 03-18-1986 | |
| 10. | 29.25 ft | on 04-13-2006 | |
| 11. | 29.12 ft | on 04-18-1982 | |
| 12. | 29.00 ft | on 01-06-1984 | |
| 13. | 28.66 ft | on 02-13-1998 | |
| 14. | 27.17 ft | on 04-02-2011 | |
| 15. | 26.90 ft | on 05-04-1978 | |
| 16. | 26.80 ft | on 04-30-1967 | 1 |
| 17. | 26.77 ft | on 03-20-1995 | |
| 18. | 25.70 ft | on 01-18-2023 | |
| 19. | 25.50 ft | on 01-12-1965 | 1 |
| 20. | 21.84 ft | on 03-04-2019 | |
| 21. | 21.83 ft | on 12-25-1955 | |
| 22. | 20.90 ft | on 03-03-1979 | |
| 23. | 20.88 ft | on 02-14-1999 | |
| 24. | 20.73 ft | on 06-02-2005 | |
| 25. | 20.40 ft | on 05-31-1963 | 1 |
| 26. | 20.40 ft | on 02-18-1973 | |
| 27. | 19.49 ft | on 01-29-1995 | |
| 28. | 18.30 ft | on 01-19-1993 | |
| 29. | 18.12 ft | on 03-06-2024 | |
| 30. | 17.90 ft | on 12-07-1965 | 1 |
| 31. | 17.90 ft | on 01-27-1974 | |
| 32. | 17.83 ft | on 04-08-2018 | |
| 33. | 17.40 ft | on 02-15-1975 | |
| 34. | 15.30 ft | on 12-23-1970 | |
| 35. | 14.50 ft | on 12-20-1985 | |
| 36. | 14.40 ft | on 01-31-1981 | |
| 37. | 14.30 ft | on 10-19-1975 | |
| 38. | 14.29 ft | on 12-09-2019 | |
| 39. | 14.21 ft | on 03-15-2016 | |
| 40. | 13.94 ft | on 01-04-2002 | |
| 41. | 13.50 ft | on 01-29-2008 | |
| 42. | 13.49 ft | on 02-26-2001 | |
| 43. | 13.12 ft | on 01-05-2005 | |
| 44. | 12.95 ft | on 05-14-2012 | |
| 45. | 12.71 ft | on 01-24-2010 | |
| 46. | 12.60 ft | on 12-27-1963 | 1 |
| 47. | 12.50 ft | on 12-30-1971 | |
| 48. | 12.37 ft | on 05-04-2013 | |
| 49. | 12.20 ft | on 02-27-2004 | |
| 50. | 12.06 ft | on 03-02-2006 | |
| 51. | 11.27 ft | on 04-21-2003 | |
| 52. | 11.25 ft | on 02-10-1995 | |
| 53. | 11.20 ft | on 03-06-1987 | |
| 54. | 11.13 ft | on 04-27-2014 | |
| 55. | 11.10 ft | on 04-27-1988 | |
| 56. | 11.02 ft | on 03-06-2009 | |
| 57. | 11.00 ft | on 01-29-1968 | 1 |
| 58. | 10.90 ft | on 05-03-1989 | |
| 59. | 10.83 ft | on 12-29-2021 | |
| 60. | 10.76 ft | on 01-31-2021 | |
| 61. | 10.20 ft | on 05-29-1990 | |
| 62. | 9.66 ft | on 04-26-2015 | |
| 63. | 9.66 ft | on 12-14-2014 | |
| 64. | 9.00 ft | on 10-02-1977 |
Vertical Datum Table
| type | NGVD29 |
|---|---|
| major Flooding | 62.30 ft |
| moderate Flooding | 57.00 ft |
| minor Flooding | 54.00 ft |
| action | 49.50 ft |
| Latest Value | 33.79 ft |
| Gauge Zero | 25.00 ft |
Probability Information
No Images Available
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
WFO Information
Weather Forecast Office
Sacramento
3310 El Camino Ave Ste 228
Sacramento, CA 95821
Official Homepage