Twin Lake Dam
Twin Lake Dam is an earth dam located in St. Clair County, Illinois. It carries a Significant hazard potential classification.
About Twin Lake Dam
The primary purpose of Twin 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 Mr. & Mrs. Beckett (private). It impounds the Trib Wolf Branch near Swansea.
The dam stands 15 feet tall and stretches 90 feet across, creates a reservoir covering 15 acres, and has a maximum storage capacity of 30 acre-feet.
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 06/06/2018.
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Location
| State | Illinois |
| County | St. Clair |
| Nearest City | Swansea |
| River/Stream | Trib Wolf Branch |
| Coordinates | 38.55857, -89.98795 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 90 ft |
Storage & Hydraulics
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 15 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | MR. & MRS. BECKETT |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 06/06/2018 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50599 |
| Federal ID | IL50599 |
| More Info | State Dam Safety Program |