Minnawanna Dam
Key Takeaway
Minnawanna Dam is classified as significant hazard in Michigan. It was completed in 1963 and is 63 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 33 ft (taller than 91.8% in MI) |
| Dam Length | 1,245 ft |
| Dam Type | Earth |
| Max Storage | 900 acre-ft |
| Normal Storage | 720 acre-ft |
| Surface Area | 60 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 285 cfs |
| Year Completed | 1963 (63 years old) |
| NID ID | MI00576 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
MDNR Parks & Recreation
State Government
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Low Hazard 8 ftFrequently Asked Questions
What is the hazard classification of Minnawanna Dam?
Minnawanna Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Minnawanna Dam?
Minnawanna Dam is owned by MDNR Parks & Recreation (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Minnawanna Dam built?
Minnawanna Dam was completed in 1963, making it 63 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 Minnawanna Dam?
Minnawanna Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Minnawanna Dam?
Minnawanna Dam has a dam height of 33 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 Minnawanna Dam last inspected?
Minnawanna Dam was last inspected on June 4, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.