Mystery Valley Lake Dam
Key Takeaway
Mystery Valley Lake Dam is classified as high hazard in Georgia. It was completed in 1960 and is 66 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 54.4% in GA) |
| Dam Length | 420 ft |
| Dam Type | Earth |
| Max Storage | 200 acre-ft |
| Normal Storage | 108 acre-ft |
| Surface Area | 15 acres |
| Year Completed | 1960 (66 years old) |
| NID ID | GA03921 |
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
DeKalb County Roads & Drainage
Local Government
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Low Hazard 16 ftFrequently Asked Questions
What is the hazard classification of Mystery Valley Lake Dam?
Mystery Valley 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 Mystery Valley Lake Dam?
Mystery Valley Lake Dam is owned by DeKalb County Roads & Drainage (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mystery Valley Lake Dam built?
Mystery Valley Lake Dam was completed in 1960, making it 66 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 Mystery Valley Lake Dam?
Mystery Valley 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 Mystery Valley Lake Dam?
Mystery Valley Lake Dam 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 Mystery Valley Lake Dam last inspected?
Mystery Valley Lake Dam was last inspected on January 7, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.