Rivers in California
San Joaquin River at Vernalis
Below flood stage
7.33ftStage
Observed Tue, Sep 29, 10:45 AM PDT
- Flood stage
- 29.00 ft
- Forecast crest
- 7.86 ftSat, Oct 3, 2:00 AM PDT
- Record crest
- 34.88 ft1997
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 37.30 ft |
| Moderate flood | 32.00 ft |
| Minor flood | 29.00 ft |
| Action | 24.50 ft |
- 37.29 ftStages above 37.3 feet results in flooding outside the levees. Top of levee.
- 29.60 ftHomes along east bank of river on Airport Court in Manteca experience flooding.
- 26.00 ftSevere seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises.
- 24.50 ftMonitor Stage - water reaches the toe of levee.
- 21.00 ftSeepage begins into crop area outside of levees.
Crest history
66 crests on NOAA’s list since 1938.
| # | Date | Stage |
|---|---|---|
| 1 | January 5, 1997 | 34.88 ft |
| 2 | January 27, 1969 | 34.55 ft |
| 3 | December 9, 1950 | 32.81 ft |
| 4 | March 16, 1938 | 32.71 ft |
| 5 | February 12, 1938 | 32.11 ft |
| 6 | February 23, 2017 | 30.72 ft |
| 7 | April 2, 1940 | 30.43 ft |
| 8 | March 19, 2023 | 29.83 ft |
| 9 | March 18, 1986 | 29.80 ft |
| 10 | April 13, 2006 | 29.25 ft |
| 11 | April 18, 1982 | 29.12 ft |
| 12 | January 6, 1984 | 29.00 ft |
| 13 | February 13, 1998 | 28.66 ft |
| 14 | April 2, 2011 | 27.17 ft |
| 15 | May 4, 1978 | 26.90 ft |
| 16 | April 30, 1967 | 26.80 ft |
| 17 | March 20, 1995 | 26.77 ft |
| 18 | January 18, 2023 | 25.70 ft |
| 19 | January 12, 1965 | 25.50 ft |
| 20 | March 4, 2019 | 21.84 ft |
| 21 | December 25, 1955 | 21.83 ft |
| 22 | March 3, 1979 | 20.90 ft |
| 23 | February 14, 1999 | 20.88 ft |
| 24 | June 2, 2005 | 20.73 ft |
| 25 | May 31, 1963 | 20.40 ft |
Most recent crests
- February 21, 2026: 16.01 ft
- March 20, 2025: 13.03 ft
- March 6, 2024: 18.12 ft
- March 19, 2023: 29.83 ft
- January 18, 2023: 25.70 ft
- December 29, 2021: 10.83 ft
- January 31, 2021: 10.76 ft
- December 9, 2019: 14.29 ft
- March 4, 2019: 21.84 ft
- April 8, 2018: 17.83 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the California Nevada River Forecast Center. Forecasts are issued routinely year-round.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.