Una S Johnson Dam
Key Takeaway
Una S Johnson Dam is classified as low hazard in South Carolina. It was completed in 1958 and is 68 years old. Its primary use is recreation.
Physical Details
| Dam Height | 47 ft (taller than 95.7% in SC) |
| Max Storage | 331 acre-ft |
| Normal Storage | 147 acre-ft |
| Surface Area | 19 acres |
| Year Completed | 1958 (68 years old) |
| NID ID | SC00271 |
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
JOHNSON HUNTER LLC
Private
Nearby Dams
Una Johnson Dam
Cherokee, SC
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Low Hazard 34 ftLockhart West Canal Embankment
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High Hazard 20 ftAdams Lake Dam
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Significant Hazard 30 ftLake John D Long
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High Hazard 49 ftCudds Pond Dam
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Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Una S Johnson Dam?
Una S 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 S Johnson Dam?
Una S Johnson Dam is owned by JOHNSON HUNTER LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Una S Johnson Dam built?
Una S Johnson Dam was completed in 1958, making it 68 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 S Johnson Dam?
Una S 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 S Johnson Dam?
Una S Johnson Dam has a dam height of 47 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 S Johnson Dam last inspected?
Una S Johnson Dam was last inspected on September 5, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.