Montello Granite
Key Takeaway
Montello Granite is classified as high hazard in Wisconsin. It was completed in 1914 and is 112 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 | 24 ft (taller than 69.1% in WI) |
| Dam Length | 55 ft |
| Dam Type | Concrete |
| Max Storage | 3.3K acre-ft |
| Normal Storage | 1.4K acre-ft |
| Surface Area | 286 acres |
| Drainage Area | 160 sq mi |
| Max Discharge | 5,353 cfs |
| Year Completed | 1914 (112 years old) |
| NID ID | WI00075 |
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
City Of Montello
Local Government
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Low Hazard 19 ftFrequently Asked Questions
What is the hazard classification of Montello Granite?
Montello Granite 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 Montello Granite?
Montello Granite is owned by City Of Montello (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Montello Granite built?
Montello Granite was completed in 1914, making it 112 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 Montello Granite?
Montello Granite serves the following purposes: Recreation, Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Montello Granite?
Montello Granite has a dam height of 24 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 Montello Granite last inspected?
Montello Granite was last inspected on October 13, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.