Lake Williamson Dam is an earth dam located in Macoupin County, Illinois, built in 1974. It carries a Low hazard potential classification.
Dam profile
NID height · 39 ft39 ft tall and 324 ft long, taller than 85% 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 Lake Williamson Dam
The primary purpose of Lake Williamson Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Williamson Christian Center (private). It impounds the Trib Honey Creek near Hardin.
The dam stands 39 feet tall and stretches 324 feet across, and has a maximum storage capacity of 1,247 acre-feet. Completed in 1974, 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 05/23/2024.
At 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Illinois |
| County | Macoupin |
| Nearest City | Hardin |
| River/Stream | Trib Honey Creek |
| Coordinates | 39.24533, -89.83403 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 324 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 1,247 acre-ft |
| Max Storage | 1,247 acre-ft |
| Normal Storage | 903 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lake Williamson Christian Center |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/23/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00775 |
| Federal ID | IL00775 |
| More Info | State Dam Safety Program |