San Joaquin River at Vernalis
Critical Stages
24.5' - Action
29' - Flood
32' - Moderate
37.3' - Major
Latest Observation
Updated: 10:45 PM PST 12/7/25
Status: No Flooding
Stage: 8.25 ft
Flow: 1.16 kcfs
Forecast
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 1 AM 12/8 | 8.24 | 1.16 |
| 2 AM 12/8 | 8.24 | 1.16 |
| 3 AM 12/8 | 8.24 | 1.16 |
| 4 AM 12/8 | 8.24 | 1.16 |
| 5 AM 12/8 | 8.24 | 1.16 |
| 6 AM 12/8 | 8.24 | 1.16 |
| 7 AM 12/8 | 8.24 | 1.16 |
| 8 AM 12/8 | 8.24 | 1.16 |
| 9 AM 12/8 | 8.24 | 1.16 |
| 10 AM 12/8 | 8.24 | 1.16 |
| 11 AM 12/8 | 8.23 | 1.15 |
| 12 PM 12/8 | 8.23 | 1.15 |
| 1 PM 12/8 | 8.23 | 1.15 |
| 2 PM 12/8 | 8.23 | 1.15 |
| 3 PM 12/8 | 8.23 | 1.15 |
| 4 PM 12/8 | 8.23 | 1.15 |
| 5 PM 12/8 | 8.23 | 1.15 |
| 6 PM 12/8 | 8.23 | 1.15 |
| 7 PM 12/8 | 8.23 | 1.15 |
| 8 PM 12/8 | 8.23 | 1.15 |
| 9 PM 12/8 | 8.23 | 1.15 |
| 10 PM 12/8 | 8.22 | 1.15 |
| 11 PM 12/8 | 8.22 | 1.15 |
| 12 AM 12/9 | 8.22 | 1.15 |
| 1 AM 12/9 | 8.22 | 1.15 |
| 2 AM 12/9 | 8.22 | 1.15 |
| 3 AM 12/9 | 8.22 | 1.15 |
| 4 AM 12/9 | 8.22 | 1.15 |
| 5 AM 12/9 | 8.22 | 1.15 |
| 6 AM 12/9 | 8.22 | 1.15 |
| 7 AM 12/9 | 8.22 | 1.15 |
| 8 AM 12/9 | 8.22 | 1.15 |
| 9 AM 12/9 | 8.22 | 1.15 |
| 10 AM 12/9 | 8.22 | 1.15 |
| 11 AM 12/9 | 8.21 | 1.14 |
| 12 PM 12/9 | 8.21 | 1.14 |
| 1 PM 12/9 | 8.21 | 1.14 |
| 2 PM 12/9 | 8.21 | 1.14 |
| 3 PM 12/9 | 8.21 | 1.14 |
| 4 PM 12/9 | 8.21 | 1.14 |
| 5 PM 12/9 | 8.21 | 1.14 |
| 6 PM 12/9 | 8.21 | 1.14 |
| 7 PM 12/9 | 8.21 | 1.14 |
| 8 PM 12/9 | 8.21 | 1.14 |
| 9 PM 12/9 | 8.21 | 1.14 |
| 10 PM 12/9 | 8.21 | 1.14 |
| 11 PM 12/9 | 8.21 | 1.14 |
| 12 AM 12/10 | 8.2 | 1.14 |
| 1 AM 12/10 | 8.2 | 1.14 |
| 2 AM 12/10 | 8.2 | 1.14 |
| 3 AM 12/10 | 8.2 | 1.14 |
| 4 AM 12/10 | 8.2 | 1.14 |
| 5 AM 12/10 | 8.2 | 1.14 |
| 6 AM 12/10 | 8.2 | 1.14 |
| 7 AM 12/10 | 8.2 | 1.14 |
| 8 AM 12/10 | 8.2 | 1.14 |
| 9 AM 12/10 | 8.2 | 1.14 |
| 10 AM 12/10 | 8.2 | 1.14 |
| 11 AM 12/10 | 8.19 | 1.13 |
| 12 PM 12/10 | 8.19 | 1.13 |
| 1 PM 12/10 | 8.19 | 1.13 |
| 2 PM 12/10 | 8.19 | 1.13 |
| 3 PM 12/10 | 8.19 | 1.13 |
| 4 PM 12/10 | 8.19 | 1.13 |
| 5 PM 12/10 | 8.19 | 1.13 |
| 6 PM 12/10 | 8.19 | 1.13 |
| 7 PM 12/10 | 8.19 | 1.13 |
| 8 PM 12/10 | 8.19 | 1.13 |
| 9 PM 12/10 | 8.18 | 1.12 |
| 10 PM 12/10 | 8.18 | 1.12 |
| 11 PM 12/10 | 8.18 | 1.12 |
| 12 AM 12/11 | 8.18 | 1.12 |
| 1 AM 12/11 | 8.18 | 1.12 |
| 2 AM 12/11 | 8.18 | 1.12 |
| 3 AM 12/11 | 8.18 | 1.12 |
| 4 AM 12/11 | 8.18 | 1.12 |
| 5 AM 12/11 | 8.18 | 1.12 |
| 6 AM 12/11 | 8.17 | 1.12 |
| 7 AM 12/11 | 8.17 | 1.12 |
| 8 AM 12/11 | 8.17 | 1.12 |
| 9 AM 12/11 | 8.17 | 1.12 |
| 10 AM 12/11 | 8.17 | 1.12 |
| 11 AM 12/11 | 8.17 | 1.12 |
| 12 PM 12/11 | 8.17 | 1.12 |
| 1 PM 12/11 | 8.17 | 1.12 |
| 2 PM 12/11 | 8.17 | 1.12 |
| 3 PM 12/11 | 8.16 | 1.11 |
| 4 PM 12/11 | 8.16 | 1.11 |
| 5 PM 12/11 | 8.16 | 1.11 |
| 6 PM 12/11 | 8.16 | 1.11 |
| 7 PM 12/11 | 8.16 | 1.11 |
| 8 PM 12/11 | 8.16 | 1.11 |
| 9 PM 12/11 | 8.16 | 1.11 |
| 10 PM 12/11 | 8.16 | 1.11 |
| 11 PM 12/11 | 8.16 | 1.11 |
| 12 AM 12/12 | 8.15 | 1.11 |
| 1 AM 12/12 | 8.15 | 1.11 |
| 2 AM 12/12 | 8.15 | 1.11 |
| 3 AM 12/12 | 8.15 | 1.11 |
| 4 AM 12/12 | 8.15 | 1.11 |
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 11:45 PM 12/7 | 8.26 | 1.17 |
| 11:30 PM 12/7 | 8.26 | 1.17 |
| 11:15 PM 12/7 | 8.26 | 1.17 |
| 11:00 PM 12/7 | 8.26 | 1.17 |
| 10:45 PM 12/7 | 8.25 | 1.16 |
| 10:30 PM 12/7 | 8.25 | 1.16 |
| 10:15 PM 12/7 | 8.26 | 1.17 |
| 10:00 PM 12/7 | 8.26 | 1.17 |
| 9:45 PM 12/7 | 8.25 | 1.16 |
| 9:30 PM 12/7 | 8.26 | 1.17 |
| 9:15 PM 12/7 | 8.26 | 1.17 |
| 9:00 PM 12/7 | 8.26 | 1.17 |
| 8:45 PM 12/7 | 8.26 | 1.17 |
| 8:30 PM 12/7 | 8.26 | 1.17 |
| 8:15 PM 12/7 | 8.25 | 1.16 |
| 8:00 PM 12/7 | 8.26 | 1.17 |
| 7:45 PM 12/7 | 8.26 | 1.17 |
| 7:30 PM 12/7 | 8.26 | 1.17 |
| 7:15 PM 12/7 | 8.26 | 1.17 |
| 7:00 PM 12/7 | 8.26 | 1.17 |
| 6:45 PM 12/7 | 8.26 | 1.17 |
| 6:30 PM 12/7 | 8.26 | 1.17 |
| 6:15 PM 12/7 | 8.26 | 1.17 |
| 6:00 PM 12/7 | 8.26 | 1.17 |
| 5:45 PM 12/7 | 8.26 | 1.17 |
| 5:30 PM 12/7 | 8.26 | 1.17 |
| 5:15 PM 12/7 | 8.26 | 1.17 |
| 5:00 PM 12/7 | 8.26 | 1.17 |
| 4:45 PM 12/7 | 8.26 | 1.17 |
| 4:30 PM 12/7 | 8.26 | 1.17 |
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.
24.5' -
Monitor Stage - water reaches the toe of levee.
21' -
Seepage begins into crop area outside of levees.
| Date | Stage (ft) |
|---|---|
| Jan 5, 1997 | 34.88 |
| Jan 27, 1969 | 34.55 |
| Dec 9, 1950 | 32.81 |
| Mar 16, 1938 | 32.71 |
| Feb 12, 1938 | 32.11 |
| Feb 23, 2017 | 30.72 |
| Apr 2, 1940 | 30.43 |
| Mar 19, 2023 | 29.83 |
| Mar 18, 1986 | 29.8 |
| Apr 13, 2006 | 29.25 |
| Apr 18, 1982 | 29.12 |
| Jan 6, 1984 | 29 |
| Feb 13, 1998 | 28.66 |
| Apr 2, 2011 | 27.17 |
| May 4, 1978 | 26.9 |
| Apr 30, 1967 | 26.8 |
| Mar 20, 1995 | 26.77 |
| Jan 18, 2023 | 25.7 |
| Jan 12, 1965 | 25.5 |
| Mar 4, 2019 | 21.84 |
Data provided by the National Weather Service.
