Upper South Dam
Low HazardSatisfactory ConditionEmergency Action Plan: Not Required
Location
| State | Michigan |
| County | Alpena |
| Nearest City | Lachine |
| River/Stream | Thunder Bay |
| Coordinates | 45.02400, -83.79100 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 350 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 55,000 acre-ft |
| Max Storage | 55,000 acre-ft |
| Normal Storage | 40,100 acre-ft |
| Surface Area | 7,000 acres |
| Drainage Area | 182 sq mi |
| Max Discharge | 4,850 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner Type | Not Listed |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/17/2019 |
| Emergency Action Plan | Not Required |