Eddy Lake Dam is an earth dam located in McHenry County, Illinois, built in 1965. It carries a Low hazard potential classification.
Dam profile
NID height · 14 ft14 ft tall and 850 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 Eddy Lake Dam
The primary purpose of Eddy Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Jeanne Eddy (private). It impounds the Trib Kishwaukee River near Marengo-offstream.
The dam stands 14 feet tall and stretches 850 feet across, and has a maximum storage capacity of 70 acre-feet. Completed in 1965, the structure is well into its service life at over 50 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 10/18/2024.
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Location
| State | Illinois |
| County | McHenry |
| Nearest City | Marengo-offstream |
| River/Stream | Trib Kishwaukee River |
| Coordinates | 42.26173, -88.47611 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 850 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 50 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Jeanne Eddy |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/18/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01123 |
| Federal ID | IL01123 |
| More Info | State Dam Safety Program |