Irwin Lake Dam
Illinois — Mercer County — TRIB EDWARDS RIVER
Location
| State | Illinois |
| County | Mercer |
| River | TRIB EDWARDS RIVER |
| Coordinates | 41.21437, -90.74444 |
Physical Characteristics
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 430 ft |
| NID Storage | 125 acre-ft |
| Max Storage | 125 acre-ft |
| Surface Area | — |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | Not Available |
| EAP Status | No |
| Last Inspection | May 2, 2025 |
| Inspection Frequency | 5 |
Dam Information
| Year Completed | 1965 |
| Primary Purpose | Recreation |
| Dam Type | Earth |
| Owner Type | Private |
| Owner | MARIE IRWIN |
| Other Name | Irwin Lake |
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.