Island Lake Dam
Illinois — McHenry County — COTTON CREEK
Location
| State | Illinois |
| County | McHenry |
| River | COTTON CREEK |
| Coordinates | 42.27522, -88.20185 |
Physical Characteristics
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 160 ft |
| NID Storage | 470 acre-ft |
| Max Storage | 470 acre-ft |
| Surface Area | — |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | Not Available |
| EAP Status | No |
| Last Inspection | August 11, 2025 |
| Inspection Frequency | 5 |
Dam Information
| Year Completed | 1940 |
| Primary Purpose | Recreation |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | VILLAGE OF ISLAND LAKE |
| Other Name | Island 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.