Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam
Key Takeaway
Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam is classified as low hazard in Illinois. It was completed in 2006 and is 20 years old. Its primary use is tailings.
Physical Details
| Dam Height | 34 ft (taller than 73.9% in IL) |
| Dam Length | 7,357 ft |
| Dam Type | Other |
| Max Storage | 1.6K acre-ft |
| Normal Storage | 1.2K acre-ft |
| Surface Area | 64 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 315 cfs |
| Year Completed | 2006 (20 years old) |
| NID ID | IL50554 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
COULTERVILLE COAL COMPANY, LLC
Private
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Significant Hazard 16 ftFrequently Asked Questions
What is the hazard classification of Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam?
Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam?
Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam is owned by COULTERVILLE COAL COMPANY, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam built?
Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam was completed in 2006, making it 20 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 Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam?
Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam serves the following purposes: Tailings. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam?
Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam has a dam height of 34 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 Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam last inspected?
Coulterville Coal/Gateway Mine/Slurry Cell 4 Dam was last inspected on June 23, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.