Orland Park Basin Dam is an earth dam located in Cook County, Illinois, built in 1992. It carries a Low hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 3,600 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Orland Park Basin Dam
The primary purpose of Orland Park Basin Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Village of Orland Park (local government). It impounds the Marley Creek near Orland Park.
The dam stands 7 feet tall and stretches 3,600 feet across, and has a maximum storage capacity of 220 acre-feet. Completed in 1992, the structure is 34 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 10/29/2025.
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Location
| State | Illinois |
| County | Cook |
| Nearest City | Orland Park |
| River/Stream | Marley Creek |
| Coordinates | 41.60137, -87.87146 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 3,600 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 220 acre-ft |
| Max Storage | 220 acre-ft |
| Max Discharge | 476 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Village of Orland Park |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/29/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50144 |
| Federal ID | IL50144 |
| More Info | State Dam Safety Program |