Stonegate Lake Dam
Stonegate Lake Dam is an earth dam located in Monroe County, Illinois, built in 1960. It carries a High hazard potential classification.
About Stonegate Lake Dam
The primary purpose of Stonegate 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 George Weber (private). It impounds the Trib Carr Creek near Columbia.
The dam stands 23 feet tall and stretches 200 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 10 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1960, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 10/09/2025.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Illinois dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Monroe |
| Nearest City | Columbia |
| River/Stream | Trib Carr Creek |
| Coordinates | 38.43653, -90.20922 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 200 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 10 acre-ft |
| Max Storage | 10 acre-ft |
| Normal Storage | 7 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 76 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | GEORGE WEBER |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 10/09/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50515 |
| Federal ID | IL50515 |
| More Info | State Dam Safety Program |