John Long Dam
Key Takeaway
John Long Dam is classified as low hazard in South Carolina. It was completed in 1990 and is 36 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 29 ft (taller than 77.1% in SC) |
| Max Storage | 175 acre-ft |
| Normal Storage | 115 acre-ft |
| Surface Area | 12 acres |
| Year Completed | 1990 (36 years old) |
| NID ID | SC02551 |
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
JOHN F AND SUSAN E LONG TRUSTEES
Private
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Unknown 26 ftFrequently Asked Questions
What is the hazard classification of John Long Dam?
John Long 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 John Long Dam?
John Long Dam is owned by JOHN F AND SUSAN E LONG TRUSTEES (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was John Long Dam built?
John Long Dam was completed in 1990, making it 36 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 John Long Dam?
John Long Dam serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is John Long Dam?
John Long Dam has a dam height of 29 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 John Long Dam last inspected?
John Long Dam was last inspected on October 4, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.