Flat Rock Dam
Key Takeaway
Flat Rock Dam is classified as high hazard in Michigan. It was completed in 1924 and is 102 years old. Its primary use is recreation. 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 | 17 ft (taller than 61.1% in MI) |
| Dam Length | 530 ft |
| Dam Type | Gravity |
| Max Storage | 2.4K acre-ft |
| Normal Storage | 1.6K acre-ft |
| Surface Area | 188 acres |
| Drainage Area | 876 sq mi |
| Max Discharge | 14,560 cfs |
| Year Completed | 1924 (102 years old) |
| NID ID | MI00556 |
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
Huron-Clinton Metro Authority
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Flat Rock Dam?
Flat Rock Dam 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 Flat Rock Dam?
Flat Rock Dam is owned by Huron-Clinton Metro Authority (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Flat Rock Dam built?
Flat Rock Dam was completed in 1924, making it 102 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 Flat Rock Dam?
Flat Rock 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 Flat Rock Dam?
Flat Rock Dam has a dam height of 17 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 Flat Rock Dam last inspected?
Flat Rock Dam was last inspected on July 23, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.