Osage Lake Dam
Osage Lake Dam is an earth dam located in Macoupin County, Illinois. It carries a Significant hazard potential classification.
About Osage Lake Dam
The primary purpose of Osage Lake Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Stewart, Darr, Burray, Jet Development Llc (private). It impounds the Trib West Fork Wood R near Brighton.
The dam stands 38 feet tall and stretches 220 feet across.
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 04/30/2025.
At 38 feet, this dam is taller than 85% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Macoupin |
| Nearest City | Brighton |
| River/Stream | Trib West Fork Wood R |
| Coordinates | 39.03333, -90.11031 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 220 ft |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | STEWART, DARR, BURRAY, JET DEVELOPMENT LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 04/30/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IL50739 |
| Federal ID | IL50739 |
| More Info | State Dam Safety Program |