Alligator Lake
Key Takeaway
Alligator Lake is classified as low hazard in Louisiana. It was completed in 1955 and is 71 years old. Its primary use is recreation.
Physical Details
| Dam Height | 34 ft (taller than 92.5% in LA) |
| Dam Length | 1,000 ft |
| Dam Type | Earth |
| Max Storage | 140 acre-ft |
| Normal Storage | 80 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 270 cfs |
| Year Completed | 1955 (71 years old) |
| Year Modified | 1991 |
| NID ID | LA00170 |
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
Fort Johnson
Federal Government
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Low Hazard 9 ftFrequently Asked Questions
What is the hazard classification of Alligator Lake?
Alligator Lake 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 Alligator Lake?
Alligator Lake is owned by Fort Johnson (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Alligator Lake built?
Alligator Lake was completed in 1955, making it 71 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 Alligator Lake?
Alligator 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 Alligator Lake?
Alligator Lake has a dam height of 34 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 Alligator Lake last inspected?
Alligator Lake was last inspected on April 28, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.