Grasslands Basin Dam
Illinois — Cook County — TRIB MARLEY CREEK
Location
| State | Illinois |
| County | Cook |
| River | TRIB MARLEY CREEK |
| Coordinates | 41.58517, -87.89807 |
Physical Characteristics
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | — |
| NID Storage | 22 acre-ft |
| Max Storage | 22 acre-ft |
| Surface Area | — |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | October 29, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | — |
| Primary Purpose | Flood Risk Reduction |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | VILLAGE OF ORLAND PARK |
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.