Countryside Landfill Dam is an earth dam located in Lake County, Illinois, built in 1997. It carries a Low hazard potential classification.
Dam profile
NID height · 13 ft13 ft tall and 960 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 Countryside Landfill Dam
The primary purpose of Countryside Landfill 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 Waste Management (private). It impounds the Avon-fremont Drainage Ditch near Grayslake.
The dam stands 13 feet tall and stretches 960 feet across, creates a reservoir covering 122 acres, has a maximum storage capacity of 66 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1997, the structure is 29 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. The most recent inspection on record was 10/30/2024.
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Location
| State | Illinois |
| County | Lake |
| Nearest City | Grayslake |
| River/Stream | Avon-fremont Drainage Ditch |
| Coordinates | 42.32297, -88.02989 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 960 ft |
| Year Completed | 1997 (29 years old) |
Storage & Hydraulics
| NID Storage | 66 acre-ft |
| Max Storage | 66 acre-ft |
| Surface Area | 122 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Waste Management |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/30/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL55008 |
| Federal ID | IL55008 |
| More Info | State Dam Safety Program |