Lake St. Louis Dam
Key Takeaway
Lake St. Louis Dam is classified as high hazard in Missouri. It was completed in 1973 and is 53 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 | 47 ft (taller than 93.7% in MO) |
| Dam Length | 900 ft |
| Dam Type | Earth |
| Max Storage | 14.7K acre-ft |
| Normal Storage | 6.3K acre-ft |
| Surface Area | 563 acres |
| Drainage Area | 56 sq mi |
| Max Discharge | 36,700 cfs |
| Year Completed | 1973 (53 years old) |
| NID ID | MO10545 |
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
LAKE ST LOUIS COMM ASSOC
Private
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Low Hazard 34 ftFrequently Asked Questions
What is the hazard classification of Lake St. Louis Dam?
Lake St. Louis 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 Lake St. Louis Dam?
Lake St. Louis Dam is owned by LAKE ST LOUIS COMM ASSOC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake St. Louis Dam built?
Lake St. Louis Dam was completed in 1973, making it 53 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 Lake St. Louis Dam?
Lake St. Louis 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 Lake St. Louis Dam?
Lake St. Louis Dam has a dam height of 47 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 Lake St. Louis Dam last inspected?
Lake St. Louis Dam was last inspected on October 5, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.