Tiskilwa Structure 1 Dam
Key Takeaway
Tiskilwa Structure 1 Dam is classified as high hazard in Illinois. It was completed in 1960 and is 66 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 | 49 ft (taller than 91.2% in IL) |
| Dam Length | 930 ft |
| Dam Type | Earth |
| Max Storage | 764 acre-ft |
| Normal Storage | 99 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,887 cfs |
| Year Completed | 1960 (66 years old) |
| NID ID | IL00449 |
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
VILLAGE OF TISKILWA
Local Government
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What is the hazard classification of Tiskilwa Structure 1 Dam?
Tiskilwa Structure 1 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 Tiskilwa Structure 1 Dam?
Tiskilwa Structure 1 Dam is owned by VILLAGE OF TISKILWA (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Tiskilwa Structure 1 Dam built?
Tiskilwa Structure 1 Dam was completed in 1960, making it 66 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 Tiskilwa Structure 1 Dam?
Tiskilwa Structure 1 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 Tiskilwa Structure 1 Dam?
Tiskilwa Structure 1 Dam has a dam height of 49 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 Tiskilwa Structure 1 Dam last inspected?
Tiskilwa Structure 1 Dam was last inspected on May 10, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.