Long Lake
Key Takeaway
Long Lake is classified as high hazard in Wisconsin. It was completed in 1913 and is 113 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 | 15 ft (taller than 45% in WI) |
| Dam Length | 575 ft |
| Dam Type | Gravity |
| Max Storage | 35.0K acre-ft |
| Normal Storage | 15.0K acre-ft |
| Surface Area | 3,290 acres |
| Drainage Area | 82 sq mi |
| Max Discharge | 2,660 cfs |
| Year Completed | 1913 (113 years old) |
| NID ID | WI00325 |
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
Washburn County
Local Government
Nearby Dams
Bear Lake
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Low Hazard 22 ftCedar Lake
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Low Hazard 21 ftBirch Lake
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Significant Hazard 28 ftSlim Creek
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High Hazard 15 ftUpper Flowage
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Low Hazard 12 ftBolger
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Low Hazard 16 ftLittle Bear Creek
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Low Hazard 10 ftMurphy
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Low Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Long Lake?
Long Lake 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 Long Lake?
Long Lake is owned by Washburn County (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Long Lake built?
Long Lake was completed in 1913, making it 113 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 Long Lake?
Long Lake 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 Long Lake?
Long Lake has a dam height of 15 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 Long Lake last inspected?
Long Lake was last inspected on May 7, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.