Wanboro Lake Dam
Wanboro Lake Dam is an earth dam located in Edwards County, Illinois, built in 1977. It carries a Significant hazard potential classification.
About Wanboro Lake Dam
The primary purpose of Wanboro Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Wanboro Lake Homeowners Association (private). It impounds the Trib Butter Creek.
The dam stands 28 feet tall and stretches 500 feet across, and has a maximum storage capacity of 183 acre-feet. Completed in 1977, the structure is 49 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 07/29/2025.
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Location
| State | Illinois |
| County | Edwards |
| River/Stream | Trib Butter Creek |
| Coordinates | 38.37881, -88.07761 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 500 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 183 acre-ft |
| Max Storage | 183 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | WANBORO LAKE HOMEOWNERS ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 07/29/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50645 |
| Federal ID | IL50645 |
| More Info | State Dam Safety Program |