Dynegy/vermilion Station/fly Ash Disposal Pond Dam is an earth dam located in Vermilion County, Illinois, built in 1991. It carries a Low hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 2,000 ft long, taller than 86% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Dynegy/vermilion Station/fly Ash Disposal Pond Dam
The primary purpose of Dynegy/vermilion Station/fly Ash Disposal Pond Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Dynegy Midwest Generation, LLC (public utility). It impounds the Middle Fork Vermilion River.
The dam stands 40 feet tall and stretches 2,000 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 566 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1991, the structure is 35 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 09/08/2025.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Illinois |
| County | Vermilion |
| Nearest City | None |
| River/Stream | Middle Fork Vermilion River |
| Coordinates | 40.17895, -87.73582 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 2,000 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 566 acre-ft |
| Max Storage | 566 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Dynegy Midwest Generation, LLC |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/08/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50291 |
| Federal ID | IL50291 |
| More Info | State Dam Safety Program |