Soo Locks
Michigan — Chippewa County — ST MARY S
Location
| State | Michigan |
| County | Chippewa |
| River | ST MARY S |
| Coordinates | 46.50422, -84.34961 |
Physical Characteristics
| NID Height | 17 ft |
| Dam Height | — |
| Dam Length | 968 ft |
| NID Storage | 277,540,000 acre-ft |
| Max Storage | 277,540,000 acre-ft |
| Surface Area | 20,255,000 acres |
Safety Classification
| Hazard Potential | Significant |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | June 13, 2025 |
| Inspection Frequency | 5 |
Dam Information
| Year Completed | 1921 |
| Primary Purpose | Navigation |
| Dam Type | Concrete |
| Owner Type | Federal |
| Owner | Canada;USACE - Detroit District |
| Other Name | Superior |
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.