Central Illinois Public Service Company Lake Dam is an earth dam located in Effingham County, Illinois, built in 1930. It carries a Significant hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 419 ft long, taller than 80% 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 Central Illinois Public Service Company Lake Dam
The primary purpose of Central Illinois Public Service Company Lake Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City of Effingham (local government). It impounds the Trib Little Wabash River near Louisville.
The dam stands 35 feet tall and stretches 419 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 341 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1930, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 06/05/2024.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Illinois |
| County | Effingham |
| Nearest City | Louisville |
| River/Stream | Trib Little Wabash River |
| Coordinates | 39.11331, -88.58546 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 419 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 341 acre-ft |
| Max Storage | 341 acre-ft |
| Normal Storage | 282 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 850 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Effingham |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/05/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00606 |
| Federal ID | IL00606 |
| More Info | State Dam Safety Program |