Wilkinson Pond Dam is an earth dam located in Madison County, Illinois, built in 1968. It carries a Low hazard potential classification.
Dam profile
NID height · 37 ft37 ft tall and 302 ft long, taller than 83% of U.S. dams with a recorded height. 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 Wilkinson Pond Dam
The primary purpose of Wilkinson Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by John & Eva Dunn (private). It impounds the Rocky Fork near Lockhaven.
The dam stands 37 feet tall and stretches 302 feet across, and has a maximum storage capacity of 123 acre-feet. Completed in 1968, 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 08/20/2025.
At 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Illinois |
| County | Madison |
| Nearest City | Lockhaven |
| River/Stream | Rocky Fork |
| Coordinates | 38.95501, -90.23049 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 302 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 123 acre-ft |
| Max Storage | 123 acre-ft |
| Normal Storage | 79 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | John & Eva Dunn |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/20/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00188 |
| Federal ID | IL00188 |
| More Info | State Dam Safety Program |