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Walnut Creek
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| Watershed Size | 93556.5 acres |
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| Length of Longest Branch of Creek | 28.74 miles |
| Total Channel Length in Watershed | 309.75 miles |
| Average Annual Rainfall | 20.5 inches |
| Estimated Mean Daily Flow | 81.37 cfs |
| Estimated 100-Year Flood Flow | 25600 cfs* |
| Highest Elevation in Watershed | 3849 feet |
| Population (estimated) | 339100 people |
| Estimated Percent Impervious | 30.00% |
| Recognized Pollutants of Concern | Diazinon |