Chalk Hills
Key Takeaway
Chalk Hills is classified as high hazard in Wisconsin. It was completed in 1927 and is 99 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 | 43 ft (taller than 94.9% in WI) |
| Dam Length | 900 ft |
| Dam Type | Gravity |
| Max Storage | 13.1K acre-ft |
| Normal Storage | 7.7K acre-ft |
| Surface Area | 766 acres |
| Drainage Area | 3,321 sq mi |
| Max Discharge | 67,500 cfs |
| Year Completed | 1927 (99 years old) |
| NID ID | WI05010 |
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
WE ENERGIES
Private
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What is the hazard classification of Chalk Hills?
Chalk Hills 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 Chalk Hills?
Chalk Hills is owned by WE ENERGIES (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Chalk Hills built?
Chalk Hills was completed in 1927, making it 99 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 Chalk Hills?
Chalk Hills 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 Chalk Hills?
Chalk Hills has a dam height of 43 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 Chalk Hills last inspected?
Chalk Hills was last inspected on February 3, 2015. Inspection dates indicate when a formal review occurred, not the results of that inspection.