International Coal/Viper/Slurry Impoundment
Key Takeaway
International Coal/Viper/Slurry Impoundment is classified as high hazard in Illinois. It was completed in 1984 and is 42 years old. Its primary use is other. 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 | 109 ft (taller than 99.6% in IL) |
| Dam Length | 11,950 ft |
| Dam Type | Earth |
| Max Storage | 3.9K acre-ft |
| Normal Storage | 3.2K acre-ft |
| Surface Area | 78 acres |
| Year Completed | 1984 (42 years old) |
| Year Modified | 2015 |
| NID ID | IL50015 |
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
INTERNATIONAL COAL GROUP, INC.
Private
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Low Hazard 19 ftFrequently Asked Questions
What is the hazard classification of International Coal/Viper/Slurry Impoundment?
International Coal/Viper/Slurry Impoundment 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 International Coal/Viper/Slurry Impoundment?
International Coal/Viper/Slurry Impoundment is owned by INTERNATIONAL COAL GROUP, INC. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was International Coal/Viper/Slurry Impoundment built?
International Coal/Viper/Slurry Impoundment was completed in 1984, making it 42 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 International Coal/Viper/Slurry Impoundment?
International Coal/Viper/Slurry Impoundment serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is International Coal/Viper/Slurry Impoundment?
International Coal/Viper/Slurry Impoundment has a dam height of 109 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 International Coal/Viper/Slurry Impoundment last inspected?
International Coal/Viper/Slurry Impoundment was last inspected on April 26, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.