Johnstone Lake Dam
Key Takeaway
Johnstone Lake Dam is classified as high hazard in Mississippi. It was completed in 1965 and is 61 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 | 31 ft (taller than 91.6% in MS) |
| Dam Length | 1,900 ft |
| Dam Type | Earth |
| Max Storage | 1.5K acre-ft |
| Normal Storage | 1.1K acre-ft |
| Surface Area | 104 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,175 cfs |
| Year Completed | 1965 (61 years old) |
| NID ID | MS02258 |
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
JOHNSTONE PROPERTY OWNERS ASSOCIATION
Private
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What is the hazard classification of Johnstone Lake Dam?
Johnstone 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 Johnstone Lake Dam?
Johnstone Lake Dam is owned by JOHNSTONE PROPERTY OWNERS ASSOCIATION (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnstone Lake Dam built?
Johnstone Lake Dam was completed in 1965, making it 61 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 Johnstone Lake Dam?
Johnstone Lake Dam 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 Johnstone Lake Dam?
Johnstone Lake Dam has a dam height of 31 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 Johnstone Lake Dam last inspected?
Johnstone Lake Dam was last inspected on October 26, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.