Shady Eighty Acres Lake Dam is an earth dam located in Greene County, Illinois, built in 1966. It carries a Low hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 430 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 Shady Eighty Acres Lake Dam
The primary purpose of Shady Eighty Acres Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Fred W. Wideman (private). It impounds the Taylor Creek-offstream near Spankey.
The dam stands 17 feet tall and stretches 430 feet across, and has a maximum storage capacity of 105 acre-feet. Completed in 1966, 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 08/27/2025.
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Location
| State | Illinois |
| County | Greene |
| Nearest City | Spankey |
| River/Stream | Taylor Creek-offstream |
| Coordinates | 39.29232, -90.20295 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 430 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 105 acre-ft |
| Max Storage | 105 acre-ft |
| Normal Storage | 69 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Fred W. Wideman |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/27/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00759 |
| Federal ID | IL00759 |
| More Info | State Dam Safety Program |