Coopers Farm Sediment Storage Dam
Coopers Farm Sediment Storage Dam is an earth dam located in Lake County, Illinois. It carries a High hazard potential classification.
About Coopers Farm Sediment Storage Dam
The primary purpose of Coopers Farm Sediment Storage Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Illinois Department Of Natural Resources (state). It impounds the Lake Marie - Offstream near Antioch.
The dam stands 13 feet tall and stretches 2,500 feet across, has a maximum storage capacity of 6 acre-feet, and collects water from a drainage area of 0 square miles.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 12/16/2024.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Illinois dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Lake |
| Nearest City | Antioch |
| River/Stream | Lake Marie - Offstream |
| Coordinates | 42.45881, -88.14467 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 2,500 ft |
Storage & Hydraulics
| NID Storage | 6 acre-ft |
| Max Storage | 6 acre-ft |
| Drainage Area | 0 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | ILLINOIS DEPARTMENT OF NATURAL RESOURCES |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 12/16/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL55139 |
| Federal ID | IL55139 |
| More Info | State Dam Safety Program |