Mlsna
Key Takeaway
Mlsna is classified as high hazard in Wisconsin. It was completed in 1956 and is 70 years old. Its primary use is flood risk reduction. 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 | 35 ft (taller than 88.5% in WI) |
| Dam Length | 580 ft |
| Dam Type | Earth |
| Max Storage | 257 acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,800 cfs |
| Year Completed | 1956 (70 years old) |
| NID ID | WI00403 |
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
Vernon County
Local Government
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Low Hazard 46 ftFrequently Asked Questions
What is the hazard classification of Mlsna?
Mlsna 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 Mlsna?
Mlsna is owned by Vernon County (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mlsna built?
Mlsna was completed in 1956, making it 70 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 Mlsna?
Mlsna serves the following purposes: Flood Risk Reduction, Debris Control. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Mlsna?
Mlsna has a dam height of 35 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 Mlsna last inspected?
Mlsna was last inspected on May 11, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.