Nimisila Reservoir Dam
Key Takeaway
Nimisila Reservoir Dam is classified as high hazard in Ohio. It was completed in 1936 and is 90 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 | 44 ft (taller than 87.3% in OH) |
| Dam Length | 10,630 ft |
| Dam Type | Earth |
| Max Storage | 17.5K acre-ft |
| Normal Storage | 9.4K acre-ft |
| Surface Area | 672 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 9,926 cfs |
| Year Completed | 1936 (90 years old) |
| NID ID | OH00584 |
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
ODNR, Division of Parks & Watercraft
State Government
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Low Hazard 13 ftFrequently Asked Questions
What is the hazard classification of Nimisila Reservoir Dam?
Nimisila 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 Nimisila Reservoir Dam?
Nimisila Reservoir Dam is owned by ODNR, Division of Parks & Watercraft (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Nimisila Reservoir Dam built?
Nimisila Reservoir Dam was completed in 1936, making it 90 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 Nimisila Reservoir Dam?
Nimisila Reservoir Dam serves the following purposes: Water Supply, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Nimisila Reservoir Dam?
Nimisila Reservoir Dam has a dam height of 44 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 Nimisila Reservoir Dam last inspected?
Nimisila Reservoir Dam was last inspected on August 20, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.