Holly Dam
Key Takeaway
Holly 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 | 12 ft (taller than 32.7% in MI) |
| Dam Length | 400 ft |
| Dam Type | Earth |
| Max Storage | 555 acre-ft |
| Normal Storage | 430 acre-ft |
| Surface Area | 90 acres |
| Drainage Area | 41 sq mi |
| Max Discharge | 600 cfs |
| Year Completed | 1840 (186 years old) |
| NID ID | MI00253 |
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
Village of Holly
Local Government
Nearby Dams
Braemar Lake Dam
Oakland, MI
Low Hazard 15 ftCrystal Lake Dam
Oakland, MI
Low Hazard 15 ftSpring Lake Dam
Oakland, MI
Low Hazard 8 ftSeven Lakes Addition Dam
Oakland, MI
Low Hazard 26 ftBig Seven Lake Dam
Oakland, MI
Low Hazard 15 ftFenton Water Dam
Genesee, MI
Significant Hazard 16 ftKnoblock Lake Dam
Oakland, MI
Low Hazard 13 ftDavisburg Dam
Oakland, MI
Low Hazard 16 ftFrequently Asked Questions
What is the hazard classification of Holly Dam?
Holly 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 Holly Dam?
Holly Dam is owned by Village of Holly (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Holly Dam built?
Holly 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 Holly Dam?
Holly 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 Holly Dam?
Holly Dam has a dam height of 12 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 Holly Dam last inspected?
Holly Dam was last inspected on July 31, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.