St. Marys Lake Dam
Illinois — Lake County — BULL CREEK
Location
| State | Illinois |
| County | Lake |
| River | BULL CREEK |
| Coordinates | 42.28314, -87.98053 |
Physical Characteristics
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 389 ft |
| NID Storage | 966 acre-ft |
| Max Storage | 966 acre-ft |
| Surface Area | 96 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | September 12, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1921 |
| Primary Purpose | Recreation |
| Dam Type | Gravity |
| Owner Type | Private |
| Owner | ARCHDIOCESE OF CHICAGO |
| Other Name | St. Marys 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.