Grand Bayou Reservoir
Key Takeaway
Grand Bayou Reservoir is classified as high hazard in Louisiana. It was completed in 1994 and is 32 years old. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 36 ft (taller than 93.5% in LA) |
| Dam Length | 5,800 ft |
| Dam Type | Earth |
| Max Storage | 66.0K acre-ft |
| Normal Storage | 27.0K acre-ft |
| Surface Area | 2,700 acres |
| Drainage Area | 134 sq mi |
| Max Discharge | 32,683 cfs |
| Year Completed | 1994 (32 years old) |
| NID ID | LA00387 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Grand Bayou Reservoir Commission
Local Government
Nearby Dams
Edgar Cason Pond
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Low Hazard 19 ftRussell B. Long Lock and Dam
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Low Hazard 18 ftRawhide Creek Dam
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Low Hazard 36 ftFrequently Asked Questions
What is the hazard classification of Grand Bayou Reservoir?
Grand Bayou Reservoir is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Grand Bayou Reservoir?
Grand Bayou Reservoir is owned by Grand Bayou Reservoir Commission (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grand Bayou Reservoir built?
Grand Bayou Reservoir was completed in 1994, making it 32 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 Grand Bayou Reservoir?
Grand Bayou Reservoir serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Grand Bayou Reservoir?
Grand Bayou Reservoir has a dam height of 36 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 Grand Bayou Reservoir last inspected?
Grand Bayou Reservoir was last inspected on June 22, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.