Preston Forebay
California — Amador County — Offstream
Location
| State | California |
| County | Amador |
| River | Offstream |
| Coordinates | 38.37540, -120.92330 |
Physical Characteristics
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 176 ft |
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Surface Area | 2 acres |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | Satisfactory |
| EAP Status | No |
| Last Inspection | November 24, 2025 |
| Inspection Frequency | 0.5 |
Dam Information
| Year Completed | 1892 |
| Primary Purpose | Other |
| Dam Type | Earth |
| Owner Type | Public Utility |
| Owner | Amador Regional Sanitation Authority |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.