Southern Il Power South Fly Ash Pond Dam
Southern Il Power South Fly Ash Pond Dam is an earth dam located in Williamson County, Illinois, built in 1989. It carries a Low hazard potential classification.
About Southern Il Power South Fly Ash Pond Dam
The primary purpose of Southern Il Power South Fly Ash 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 Southern Illinois Power Cooperative (public utility). It impounds the Trib Lake Of Egypt near Goreville.
The dam stands 29 feet tall and stretches 2,100 feet across, and has a maximum storage capacity of 165 acre-feet. Completed in 1989, the structure is 37 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 09/19/2023.
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Location
| State | Illinois |
| County | Williamson |
| Nearest City | Goreville |
| River/Stream | Trib Lake Of Egypt |
| Coordinates | 37.61397, -88.95942 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 2,100 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 165 acre-ft |
| Max Storage | 165 acre-ft |
| Normal Storage | 117 acre-ft |
| Max Discharge | 91 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | SOUTHERN ILLINOIS POWER COOPERATIVE |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 09/19/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50100 |
| Federal ID | IL50100 |
| More Info | State Dam Safety Program |