Keeven Lake Dam
Keeven Lake Dam is an earth dam located in Monroe County, Illinois, built in 1998. It carries a Significant hazard potential classification.
About Keeven Lake Dam
The primary purpose of Keeven Lake Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Thomas Keevan (private). It impounds the Prairie Du Long Creek near Columbia.
The dam stands 25 feet tall and stretches 300 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 140 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1998, the structure is 28 years old.
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 07/15/2025.
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Location
| State | Illinois |
| County | Monroe |
| Nearest City | Columbia |
| River/Stream | Prairie Du Long Creek |
| Coordinates | 38.40688, -90.15293 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 300 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Normal Storage | 71 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 567 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | THOMAS KEEVAN |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 07/15/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50415 |
| Federal ID | IL50415 |
| More Info | State Dam Safety Program |