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Las Trampas Creek
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| Watershed Size | 17237.99 acres |
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| Length of Longest Branch of Creek | 12.37 miles |
| Total Channel Length in Watershed | 64.1 miles |
| Average Annual Rainfall | 26.05 inches |
| Estimated Mean Daily Flow | 15.43 cfs |
| Estimated 100-Year Flood Flow | N/A cfs* |
| Highest Elevation in Watershed | 2020 feet |
| Population (estimated) | 42300 people |
| Estimated Percent Impervious | 25.00% |
| Recognized Pollutants of Concern | Diazinon |