Preston
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | Amador |
| Nearest City | Ione |
| River/Stream | Tr Mule Creek |
| Coordinates | 38.36980, -120.93980 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 647 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 268 acre-ft |
| Max Storage | 268 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Amador Regional Sanitation Authority |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/24/2025 |
| Emergency Action Plan | Yes |