Una Johnson Dam
Key Takeaway
Una Johnson Dam is classified as low hazard in South Carolina. It was completed in 1952 and is 74 years old. Its primary use is recreation.
Physical Details
| Dam Height | 42 ft (taller than 93.6% in SC) |
| Max Storage | 394 acre-ft |
| Normal Storage | 165 acre-ft |
| Surface Area | 23 acres |
| Year Completed | 1952 (74 years old) |
| NID ID | SC00270 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
ELMWOOD FARM LP
Private
Nearby Dams
Una S Johnson Dam
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Significant Hazard 30 ftFrank Sossaman Dam
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Low Hazard 25 ftLarry Sossaman Dam 2
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Low Hazard 26 ftFrequently Asked Questions
What is the hazard classification of Una Johnson Dam?
Una Johnson Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Una Johnson Dam?
Una Johnson Dam is owned by ELMWOOD FARM LP (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Una Johnson Dam built?
Una Johnson Dam was completed in 1952, making it 74 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 Una Johnson Dam?
Una Johnson 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 Una Johnson Dam?
Una Johnson Dam has a dam height of 42 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 Una Johnson Dam last inspected?
Una Johnson Dam was last inspected on September 5, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.