Jim Falls
Key Takeaway
Jim Falls is classified as high hazard in Wisconsin. It was completed in 1923 and is 103 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 | 55 ft (taller than 98.1% in WI) |
| Dam Length | 2,589 ft |
| Dam Type | Gravity |
| Max Storage | 11.4K acre-ft |
| Normal Storage | 11.4K acre-ft |
| Surface Area | 996 acres |
| Drainage Area | 4,891 sq mi |
| Max Discharge | 330,000 cfs |
| Year Completed | 1923 (103 years old) |
| NID ID | WI00729 |
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
Northern States Power Co
Public Utility
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High Hazard 37 ftFrequently Asked Questions
What is the hazard classification of Jim Falls?
Jim Falls 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 Jim Falls?
Jim Falls is owned by Northern States Power Co (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Jim Falls built?
Jim Falls was completed in 1923, making it 103 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 Jim Falls?
Jim Falls 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 Jim Falls?
Jim Falls has a dam height of 55 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 Jim Falls last inspected?
Jim Falls was last inspected on July 13, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.