| SAN JOAQUIN RIVER - VERNALIS (VNSC1) | ||
| Latitude: 37.68º N | Longitude: 121.27º W | Elevation: 35 Feet |
| Location: San Joaquin County in CA | ||
| River Group: San Joaquin | ||
| Forecast Issued: | Jan 09 2026 at 1:17 PM PST | Next Issuance: | Jan 10 2026 at 9:00 AM PST |
| Action/ Monitor: 24.5 Ft | Minor Flood: 29.0 Ft | Moderate Flood: 32.0 Ft | Major Flood: 37.3 Ft |
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Historical Stage/Flow Data |
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Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months. |
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Water Year
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Peak Discharge (cfs)
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Stage (feet)
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Date
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| Most Recent 5 Years | |||
| 2025* | 4,9400 | 12.97 | Mar 20, 2025 |
| 2024* | 10,300 | 18.12 | Mar 6, 2024 |
| 2023* | 34,400 | 29.82 | Mar 19, 2023 |
| 2022* | 2,600 | 10.83 | Dec 29, 2021 |
| 2021* | 2,470 | 10.76 | Jan 31, 2021 |
| Historical High Stage/Flow Events (Period of Record - Jul 1922 to Present) - Ranked by Flow | |||
| 1951* | 79,000 | 27.75 | Dec 09, 1950 |
| 1997* | 75,600 | 34.88 | Jan 05, 1997 |
| 1969* | 52,600 | 34.55 | Jan 27, 1969 |
| 1938* | 51,200 | 26.64 | Mar 16, 1938 |
| 1956* | 50,900 | 26.89 | Dec 25, 1955 |
| 1983* | 45,100 | 31.49 | Mar 07, 1983 |
| * Discharge affected by regulation or diversion | |||
| Location Photographs | ||
| ESRI™ Locator Map |
| Flood Impacts | |
| 37.29 Feet | Stages above 37.3 feet results in flooding outside the levees. Top of levee. |
| 29.6 Feet | Homes along east bank of river on Airport Court in Manteca experience flooding. |
| 26.0 Feet | Severe seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises. |
| 24.5 Feet | Monitor Stage - water reaches the toe of levee. |
| 21.0 Feet | Seepage begins into crop area outside of levees. |