Pettysville Mill Dam
Key Takeaway
Pettysville Mill Dam is classified as significant hazard in Michigan. It was completed in 1840 and is 186 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 21 ft (taller than 74.1% in MI) |
| Dam Length | 370 ft |
| Dam Type | Earth |
| Max Storage | 85 acre-ft |
| Normal Storage | 36 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1840 (186 years old) |
| NID ID | MI00743 |
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
Old Mill Hills Preservation Assoc
Private
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Low Hazard 8 ftFrequently Asked Questions
What is the hazard classification of Pettysville Mill Dam?
Pettysville Mill 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 Pettysville Mill Dam?
Pettysville Mill Dam is owned by Old Mill Hills Preservation Assoc (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Pettysville Mill Dam built?
Pettysville Mill Dam was completed in 1840, making it 186 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 Pettysville Mill Dam?
Pettysville Mill 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 Pettysville Mill Dam?
Pettysville Mill Dam has a dam height of 21 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 Pettysville Mill Dam last inspected?
Pettysville Mill Dam was last inspected on November 16, 2009. Inspection dates indicate when a formal review occurred, not the results of that inspection.