Finn's Lake Dam
Finn's Lake Dam is an earth dam located in Monroe County, Illinois. It carries a Significant hazard potential classification.
About Finn's Lake Dam
The primary purpose of Finn's 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 Columbia Golf Club, Inc. (private). It impounds the Trib Hill Lake Creek near Columbia.
The dam stands 23 feet tall and stretches 420 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 64 acre-feet, and collects water from a drainage area of 0 square miles.
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. The most recent inspection on record was 08/23/2024.
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Location
| State | Illinois |
| County | Monroe |
| Nearest City | Columbia |
| River/Stream | Trib Hill Lake Creek |
| Coordinates | 38.47991, -90.21382 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 420 ft |
Storage & Hydraulics
| NID Storage | 64 acre-ft |
| Max Storage | 64 acre-ft |
| Normal Storage | 46 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 2,333 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | COLUMBIA GOLF CLUB, INC. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 08/23/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50479 |
| Federal ID | IL50479 |
| More Info | State Dam Safety Program |