Lake Hanna Dam
Key Takeaway
Lake Hanna Dam is classified as high hazard in Missouri. It was completed in 1967 and is 59 years old. Its primary use is tailings. 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 | 38 ft (taller than 88.1% in MO) |
| Dam Length | 1,650 ft |
| Dam Type | Earth |
| Max Storage | 2.0K acre-ft |
| Normal Storage | 816 acre-ft |
| Surface Area | 135 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 5,003 cfs |
| Year Completed | 1967 (59 years old) |
| NID ID | MO30314 |
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
LAKE HANNA Association. INC.
Private
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High Hazard 33 ftFrequently Asked Questions
What is the hazard classification of Lake Hanna Dam?
Lake Hanna 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 Lake Hanna Dam?
Lake Hanna Dam is owned by LAKE HANNA Association. INC. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Hanna Dam built?
Lake Hanna Dam was completed in 1967, making it 59 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 Lake Hanna Dam?
Lake Hanna Dam serves the following purposes: Tailings. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lake Hanna Dam?
Lake Hanna Dam has a dam height of 38 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 Lake Hanna Dam last inspected?
Lake Hanna Dam was last inspected on January 11, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.