Four Mile Dam
Michigan — Alpena County — Thunder Bay
Location
| State | Michigan |
| County | Alpena |
| River | Thunder Bay |
| Coordinates | 45.09270, -83.50260 |
Physical Characteristics
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 700 ft |
| NID Storage | 900 acre-ft |
| Max Storage | 900 acre-ft |
| Surface Area | 90 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Satisfactory |
| EAP Status | Yes |
| Last Inspection | August 24, 2022 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1902 |
| Primary Purpose | Hydroelectric |
| Dam Type | Gravity |
| Owner Type | Not Listed |
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.