Conway Farm Subdivision Lake Dam
Conway Farm Subdivision Lake Dam is an earth dam located in Champaign County, Illinois, built in 2004. It carries a Significant hazard potential classification.
About Conway Farm Subdivision Lake Dam
The primary purpose of Conway Farm Subdivision 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 Conway Farm Property Owners Association (private). It impounds the Trib Sangamon River near Mahomet.
The dam stands 15 feet tall and stretches 433 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 147 acre-feet, and collects water from a drainage area of 227 square miles. Completed in 2004, the structure is relatively new.
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 09/10/2025.
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Location
| State | Illinois |
| County | Champaign |
| Nearest City | Mahomet |
| River/Stream | Trib Sangamon River |
| Coordinates | 40.18045, -88.38519 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 433 ft |
| Year Completed | 2004 (22 years old) |
Storage & Hydraulics
| NID Storage | 147 acre-ft |
| Max Storage | 147 acre-ft |
| Normal Storage | 88 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 227 sq mi |
| Max Discharge | 237 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | CONWAY FARM PROPERTY OWNERS ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 09/10/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50503 |
| Federal ID | IL50503 |
| More Info | State Dam Safety Program |