Soo Locks
Key Takeaway
Soo Locks is classified as high hazard in Michigan. It was completed in 1921 and is 105 years old. Its primary use is navigation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Length | 968 ft |
| Dam Type | Concrete |
| Max Storage | 277.5M acre-ft |
| Normal Storage | 277.5M acre-ft |
| Surface Area | 20,255,000 acres |
| Drainage Area | 181,000 sq mi |
| Max Discharge | 68,000 cfs |
| Year Completed | 1921 (105 years old) |
| NID ID | MI00650 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Canada;USACE - Detroit District
Federal Government
Frequently Asked Questions
What is the hazard classification of Soo Locks?
Soo Locks is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Soo Locks?
Soo Locks is owned by Canada;USACE - Detroit District (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Soo Locks built?
Soo Locks was completed in 1921, making it 105 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Soo Locks?
Soo Locks serves the following purposes: Navigation, Fish And Wildlife Pond, Recreation, Hydroelectric, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Soo Locks last inspected?
Soo Locks was last inspected on May 25, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.