Wonder Lake Dam
Illinois — McHenry County — NIPPERSINK CREEK
Location
| State | Illinois |
| County | McHenry |
| River | NIPPERSINK CREEK |
| Coordinates | 42.40879, -88.34245 |
Physical Characteristics
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 1,050 ft |
| NID Storage | 10,194 acre-ft |
| Max Storage | 10,194 acre-ft |
| Surface Area | 728 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | October 3, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1929 |
| Primary Purpose | Recreation |
| Dam Type | Earth |
| Owner Type | Private |
| Owner | MASTER PROPERTY OWNERS ASSOCIATION, INC. |
| Other Name | Wonder 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.