Dynegy/Havana Sta/East Ash Pond System
Key Takeaway
Dynegy/Havana Sta/East Ash Pond System is classified as high hazard in Illinois. It was completed in 1999 and is 27 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 | 38 ft (taller than 80.7% in IL) |
| Dam Length | 3,800 ft |
| Dam Type | Earth |
| Max Storage | 622 acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 244 cfs |
| Year Completed | 1999 (27 years old) |
| NID ID | IL50420 |
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
DYNEGY MIDWEST GENERATION, LLC
Public Utility
Nearby Dams
Dynegy/Havana Station/Cell 1, Polishing P
Mason, IL
High Hazard 26 ftDynegy/Havana Sta/East Ash Pond Dam
Mason, IL
High Hazard 36 ftDynegy/Havana Sta/South Ash Pond Dam
Mason, IL
Significant HazardQuiver Creek Weir Dam
Mason, IL
Low Hazard 15 ftLake Chautauqua Lower Dam
Fulton, IL
Low Hazard 15 ftLake Chautauqua Upper Dam
Mason, IL
Low Hazard 17 ftCarlson Lake Water Control Dam
Schuyler, IL
Low Hazard 10 ftLake Irene Dam
Schuyler, IL
Low Hazard 33 ftFrequently Asked Questions
What is the hazard classification of Dynegy/Havana Sta/East Ash Pond System?
Dynegy/Havana Sta/East Ash Pond System 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 Dynegy/Havana Sta/East Ash Pond System?
Dynegy/Havana Sta/East Ash Pond System is owned by DYNEGY MIDWEST GENERATION, LLC (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Dynegy/Havana Sta/East Ash Pond System built?
Dynegy/Havana Sta/East Ash Pond System was completed in 1999, making it 27 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 Dynegy/Havana Sta/East Ash Pond System?
Dynegy/Havana Sta/East Ash Pond System 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 Dynegy/Havana Sta/East Ash Pond System?
Dynegy/Havana Sta/East Ash Pond System has a dam height of 38 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 Dynegy/Havana Sta/East Ash Pond System last inspected?
Dynegy/Havana Sta/East Ash Pond System was last inspected on November 10, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.