Mauvaise Terre Lake Dam
Key Takeaway
Mauvaise Terre Lake Dam is classified as high hazard in Illinois. It was completed in 1923 and is 103 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 | 30 ft (taller than 61.3% in IL) |
| Dam Length | 850 ft |
| Dam Type | Earth |
| Max Storage | 5.6K acre-ft |
| Normal Storage | 628 acre-ft |
| Surface Area | 262 acres |
| Drainage Area | 34 sq mi |
| Max Discharge | 25,539 cfs |
| Year Completed | 1923 (103 years old) |
| Year Modified | 1983 |
| NID ID | IL00709 |
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 JACKSONVILLE
Local Government
Nearby Dams
Lake Mauvaise Terre Dredge Basin Dam
Morgan, IL
Low Hazard 17 ftLake Jacksonville Dam
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Significant Hazard 54 ftApplebee Pond Dam
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Low Hazard 37 ftCarrigan Pond Dam
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Low Hazard 29 ftHadden Pond Dam
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Low Hazard 29 ftValevue Lake Dam
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Significant Hazard 20 ftRoegge Pond Dam
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Low Hazard 31 ftGross Farms Dam
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Low Hazard 27 ftFrequently Asked Questions
What is the hazard classification of Mauvaise Terre Lake Dam?
Mauvaise Terre Lake Dam 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 Mauvaise Terre Lake Dam?
Mauvaise Terre Lake Dam is owned by CITY OF JACKSONVILLE (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mauvaise Terre Lake Dam built?
Mauvaise Terre Lake Dam 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 Mauvaise Terre Lake Dam?
Mauvaise Terre Lake Dam serves the following purposes: Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Mauvaise Terre Lake Dam?
Mauvaise Terre Lake Dam has a dam height of 30 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 Mauvaise Terre Lake Dam last inspected?
Mauvaise Terre Lake Dam was last inspected on October 20, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.