Mio
Key Takeaway
Mio is classified as high hazard in Michigan. It was completed in 1917 and is 109 years old. Its primary use is hydroelectric. 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 Height | 38 ft (taller than 94% in MI) |
| Dam Length | 2,120 ft |
| Dam Type | Gravity |
| Normal Storage | 6.1K acre-ft |
| Surface Area | 661 acres |
| Drainage Area | 1,100 sq mi |
| Max Discharge | 16,000 cfs |
| Year Completed | 1917 (109 years old) |
| NID ID | MI00186 |
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
Consumers Energy Company
Public Utility
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Low Hazard 10 ftFrequently Asked Questions
What is the hazard classification of Mio?
Mio 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 Mio?
Mio is owned by Consumers Energy Company (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mio built?
Mio was completed in 1917, making it 109 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 Mio?
Mio serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Mio?
Mio has a dam height of 38 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Mio last inspected?
Mio was last inspected on September 13, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.