Johnston Irrigation Lake Dam
Key Takeaway
Johnston Irrigation Lake Dam is classified as low hazard in Georgia. It was completed in 1979 and is 47 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 25 ft (taller than 58.1% in GA) |
| Dam Length | 555 ft |
| Dam Type | Earth |
| Max Storage | 354 acre-ft |
| Normal Storage | 154 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 800 sq mi |
| Year Completed | 1979 (47 years old) |
| NID ID | GA05078 |
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
Johnston, William Jr.
Private
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Low Hazard 23 ftFrequently Asked Questions
What is the hazard classification of Johnston Irrigation Lake Dam?
Johnston Irrigation Lake 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 Johnston Irrigation Lake Dam?
Johnston Irrigation Lake Dam is owned by Johnston, William Jr. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnston Irrigation Lake Dam built?
Johnston Irrigation Lake Dam was completed in 1979, making it 47 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 Johnston Irrigation Lake Dam?
Johnston Irrigation Lake 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 Johnston Irrigation Lake Dam?
Johnston Irrigation Lake Dam has a dam height of 25 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 Johnston Irrigation Lake Dam last inspected?
Johnston Irrigation Lake Dam was last inspected on June 1, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.