Castle Rock
Key Takeaway
Castle Rock is classified as high hazard in Wisconsin. It was completed in 1950 and is 76 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 | 34 ft (taller than 87.2% in WI) |
| Dam Length | 18,700 ft |
| Dam Type | Gravity |
| Max Storage | 175.0K acre-ft |
| Normal Storage | 136.0K acre-ft |
| Surface Area | 16,640 acres |
| Drainage Area | 6,845 sq mi |
| Max Discharge | 326,000 cfs |
| Year Completed | 1950 (76 years old) |
| NID ID | WI00724 |
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 River Power Company
Public Utility
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Low Hazard 14 ftFrequently Asked Questions
What is the hazard classification of Castle Rock?
Castle Rock 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 Castle Rock?
Castle Rock is owned by Wisconsin River Power Company (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Castle Rock built?
Castle Rock was completed in 1950, making it 76 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 Castle Rock?
Castle Rock serves the following purposes: Hydroelectric, Recreation, Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Castle Rock?
Castle Rock has a dam height of 34 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 Castle Rock last inspected?
Castle Rock was last inspected on August 10, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.