Holly 9
Key Takeaway
Holly 9 is classified as low hazard in Minnesota. It was completed in 2007 and is 19 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Height | 40 ft (taller than 93.1% in MN) |
| Dam Length | 400 ft |
| Dam Type | Earth |
| Max Storage | 186 acre-ft |
| Normal Storage | 1 acre-ft |
| Drainage Area | 2 sq mi |
| Year Completed | 2007 (19 years old) |
| NID ID | MN01427 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Knakmuhs, Darold & Loren
Private
Nearby Dams
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Low Hazard 26 ftFrequently Asked Questions
What is the hazard classification of Holly 9?
Holly 9 is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Holly 9?
Holly 9 is owned by Knakmuhs, Darold & Loren (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Holly 9 built?
Holly 9 was completed in 2007, making it 19 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 9?
Holly 9 serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Holly 9?
Holly 9 has a dam height of 40 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 9 last inspected?
Holly 9 was last inspected on March 14, 2016. Inspection dates indicate when a formal review occurred, not the results of that inspection.