Thomas Hill Reservoir Dam
Key Takeaway
Thomas Hill Reservoir Dam is classified as high hazard in Missouri. It was completed in 1966 and is 60 years old. Its primary use is flood risk reduction. 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 | 70 ft (taller than 98.5% in MO) |
| Dam Length | 2,450 ft |
| Dam Type | Earth |
| Max Storage | 260.5K acre-ft |
| Normal Storage | 70.0K acre-ft |
| Surface Area | 3,500 acres |
| Drainage Area | 147 sq mi |
| Max Discharge | 12,200 cfs |
| Year Completed | 1966 (60 years old) |
| Year Modified | 1991 |
| NID ID | MO10134 |
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
ASSOCIATED ELECTRIC CORP
Public Utility
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What is the hazard classification of Thomas Hill Reservoir Dam?
Thomas Hill Reservoir 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 Thomas Hill Reservoir Dam?
Thomas Hill Reservoir Dam is owned by ASSOCIATED ELECTRIC CORP (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thomas Hill Reservoir Dam built?
Thomas Hill Reservoir Dam was completed in 1966, making it 60 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 Thomas Hill Reservoir Dam?
Thomas Hill Reservoir Dam serves the following purposes: Flood Risk Reduction, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Thomas Hill Reservoir Dam?
Thomas Hill Reservoir Dam has a dam height of 70 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 Thomas Hill Reservoir Dam last inspected?
Thomas Hill Reservoir Dam was last inspected on January 10, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.