Dynegy/havana Sta/east Ash Pond System
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | Mason |
| Nearest City | HAVANA |
| River/Stream | TRIB ILLINOIS RIVER |
| Coordinates | 40.28139, -90.07428 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 3,800 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 622 acre-ft |
| Max Storage | 622 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 244 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | DYNEGY MIDWEST GENERATION, LLC |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 10/07/2025 |
| Emergency Action Plan | Yes |