Hawthorne Hills Lake Dam
Hawthorne Hills Lake Dam is an earth dam located in Jefferson County, Illinois, built in 1969. It carries a Significant hazard potential classification.
About Hawthorne Hills Lake Dam
The primary purpose of Hawthorne Hills Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Hawthorne Hills Association (private). It impounds the Trib Casey Fork near Plumfield.
The dam stands 18 feet tall and stretches 483 feet across, and has a maximum storage capacity of 266 acre-feet. Completed in 1969, the structure is well into its service life at over 50 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 05/27/2025.
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Location
| State | Illinois |
| County | Jefferson |
| Nearest City | Plumfield |
| River/Stream | Trib Casey Fork |
| Coordinates | 38.36061, -88.92471 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 483 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 266 acre-ft |
| Max Storage | 266 acre-ft |
| Normal Storage | 126 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | HAWTHORNE HILLS ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 05/27/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00174 |
| Federal ID | IL00174 |
| More Info | State Dam Safety Program |