Lower Twin Lake
Key Takeaway
Lower Twin Lake is classified as high hazard in South Carolina. It was completed in 1940 and is 86 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 | 18 ft (taller than 37.9% in SC) |
| Dam Length | 530 ft |
| Dam Type | Earth |
| Max Storage | 650 acre-ft |
| Normal Storage | 250 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 1,500 cfs |
| Year Completed | 1940 (86 years old) |
| NID ID | SC00231 |
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
Fort Jackson
Federal Government
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High Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Lower Twin Lake?
Lower Twin Lake 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 Lower Twin Lake?
Lower Twin Lake is owned by Fort Jackson (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Twin Lake built?
Lower Twin Lake was completed in 1940, making it 86 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 Lower Twin Lake?
Lower Twin Lake 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 Lower Twin Lake?
Lower Twin Lake has a dam height of 18 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 Lower Twin Lake last inspected?
Lower Twin Lake was last inspected on March 24, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.