Altoona
Key Takeaway
Altoona is classified as high hazard in Wisconsin. It was completed in 1938 and is 88 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 | 44 ft (taller than 95.4% in WI) |
| Dam Length | 240 ft |
| Dam Type | Buttress |
| Max Storage | 14.0K acre-ft |
| Normal Storage | 8.2K acre-ft |
| Surface Area | 720 acres |
| Drainage Area | 883 sq mi |
| Max Discharge | 29,000 cfs |
| Year Completed | 1938 (88 years old) |
| NID ID | WI00011 |
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
Eau Claire County
Local Government
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Low Hazard 32 ftFrequently Asked Questions
What is the hazard classification of Altoona?
Altoona 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 Altoona?
Altoona is owned by Eau Claire County (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Altoona built?
Altoona 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 Altoona?
Altoona 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 Altoona?
Altoona has a dam height of 44 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 Altoona last inspected?
Altoona was last inspected on September 16, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.