Lake Mattoon Dam
Illinois — Shelby County — LITTLE WABASH RIVER
Location
| State | Illinois |
| County | Shelby |
| River | LITTLE WABASH RIVER |
| Coordinates | 39.33331, -88.48173 |
Physical Characteristics
| NID Height | 46 ft |
| Dam Height | 46 ft |
| Dam Length | 2,250 ft |
| NID Storage | 22,569 acre-ft |
| Max Storage | 22,569 acre-ft |
| Surface Area | 980 acres |
Safety Classification
| Hazard Potential | Significant |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | December 9, 2025 |
| Inspection Frequency | 3 |
Dam Information
| Year Completed | 1957 |
| Primary Purpose | Recreation |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | CITY OF MATTOON |
| Other Name | Lake Mattoon |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.