Tomahawk
Key Takeaway
Tomahawk is classified as high hazard in Wisconsin. It was completed in 1938 and is 88 years old. Its primary use is hydroelectric. 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 | 27 ft (taller than 75.9% in WI) |
| Dam Length | 3,400 ft |
| Dam Type | Gravity |
| Max Storage | 15.2K acre-ft |
| Normal Storage | 15.2K acre-ft |
| Surface Area | 2,773 acres |
| Drainage Area | 2,028 sq mi |
| Max Discharge | 54,000 cfs |
| Year Completed | 1938 (88 years old) |
| NID ID | WI00746 |
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
Wisconsin Public Service Corporation
Public Utility
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Low Hazard 9 ftFrequently Asked Questions
What is the hazard classification of Tomahawk?
Tomahawk 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 Tomahawk?
Tomahawk is owned by Wisconsin Public Service Corporation (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Tomahawk built?
Tomahawk was completed in 1938, making it 88 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 Tomahawk?
Tomahawk serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Tomahawk?
Tomahawk has a dam height of 27 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 Tomahawk last inspected?
Tomahawk was last inspected on August 17, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.