Lake Decatur Dam
Illinois — Macon County — SANGAMON RIVER
Location
| State | Illinois |
| County | Macon |
| River | SANGAMON RIVER |
| Coordinates | 39.82619, -88.95598 |
Physical Characteristics
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 1,728 ft |
| NID Storage | 57,520 acre-ft |
| Max Storage | 57,520 acre-ft |
| Surface Area | 3,335 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | September 8, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1922 |
| Primary Purpose | Recreation |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | CITY OF DECATUR |
| Other Name | Lake Decatur |
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.