Dynegy /wood River West Ash Disposal Pond Dam is an earth dam located in Madison County, Illinois, built in 1995. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 3,800 ft long, taller than 74% 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 /wood River West Ash Disposal Pond Dam
The primary purpose of Dynegy /wood River West 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 Trib Wood River near Wood River.
The dam stands 32 feet tall and stretches 3,800 feet across, and has a maximum storage capacity of 331 acre-feet. Completed in 1995, the structure is 31 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. The most recent inspection on record was 12/14/2020.
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Location
| State | Illinois |
| County | Madison |
| Nearest City | Wood River |
| River/Stream | Trib Wood River |
| Coordinates | 38.86902, -90.14068 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 3,800 ft |
| Year Completed | 1995 (31 years old) |
Storage & Hydraulics
| NID Storage | 331 acre-ft |
| Max Storage | 331 acre-ft |
| Normal Storage | 281 acre-ft |
| Max Discharge | 20 cfs |
| 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 | 12/14/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50281 |
| Federal ID | IL50281 |
| More Info | State Dam Safety Program |