Thomas J. O'Brien Lock and Controlling Works
Illinois — Cook County — CALUMET RIVER
Location
| State | Illinois |
| County | Cook |
| River | CALUMET RIVER |
| Coordinates | 41.65214, -87.56711 |
Physical Characteristics
| NID Height | 37 ft |
| Dam Height | — |
| Dam Length | 430 ft |
| NID Storage | 9,700 acre-ft |
| Max Storage | 9,700 acre-ft |
| Surface Area | 0 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | April 5, 2022 |
| Inspection Frequency | 5 |
Dam Information
| Year Completed | 1960 |
| Primary Purpose | Navigation |
| Dam Type | Concrete |
| Owner Type | Federal |
| Owner | USACE - Chicago District |
| Other Name | Lake Calumet |
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.