Irwin Lake Dam
Low HazardNot Available ConditionEmergency Action Plan: No
Location
| State | Illinois |
| County | Mercer |
| Nearest City | ALEDO-OFFSTREAM |
| River/Stream | TRIB EDWARDS RIVER |
| Coordinates | 41.21437, -90.74444 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 430 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 125 acre-ft |
| Max Storage | 125 acre-ft |
| Normal Storage | 87 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MARIE IRWIN |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 05/02/2025 |
| Emergency Action Plan | No |