Iatt Lake Dam
Key Takeaway
Iatt Lake Dam is classified as high hazard in Louisiana. It was completed in 1956 and is 70 years old. Its primary use is recreation. 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 | 5,310 ft |
| Dam Type | Earth |
| Max Storage | 167.0K acre-ft |
| Normal Storage | 31.0K acre-ft |
| Surface Area | 7,100 acres |
| Drainage Area | 242 sq mi |
| Max Discharge | 12,128 cfs |
| Year Completed | 1956 (70 years old) |
| Year Modified | 1966 |
| NID ID | LA00018 |
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
State of Louisiana
State Government
Nearby Dams
Red River Lock and Dam 3
Natchitoches, LA
Significant HazardCane River Lake Dam Lower Embankment
Natchitoches, LA
Low Hazard 44 ftNantachie Lake Dam No. 2
Grant, LA
Low Hazard 29 ftNantachie Lake Dam
Grant, LA
Low Hazard 37 ftBourdeux Lake
Natchitoches, LA
Low Hazard 6 ftMike Wahlder Lake Dam No. 2
Grant, LA
Low Hazard 13 ftMike Wahlder Lake Dam No. 1
Grant, LA
Low Hazard 17 ftCharles Bryant Dam
Grant, LA
Low Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Iatt Lake Dam?
Iatt Lake Dam 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 Iatt Lake Dam?
Iatt Lake Dam is owned by State of Louisiana (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Iatt Lake Dam built?
Iatt Lake Dam was completed in 1956, making it 70 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 Iatt Lake Dam?
Iatt Lake 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 Iatt Lake Dam?
Iatt Lake Dam 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 Iatt Lake Dam last inspected?
Iatt Lake Dam was last inspected on August 30, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.