French Lake Dam
French Lake Dam is an earth dam located in Macoupin County, Illinois, built in 1970. It carries a Low hazard potential classification.
About French Lake Dam
The primary purpose of French Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by A. O. French (private). It impounds the Honey Cree-offstream near Rockbridge-offstream.
The dam stands 31 feet tall and stretches 825 feet across, and has a maximum storage capacity of 86 acre-feet. Completed in 1970, 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 06/23/2025.
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Location
| State | Illinois |
| County | Macoupin |
| Nearest City | Rockbridge-offstream |
| River/Stream | Honey Cree-offstream |
| Coordinates | 39.20046, -89.77237 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 825 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 86 acre-ft |
| Max Storage | 86 acre-ft |
| Normal Storage | 66 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | A. O. FRENCH |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 06/23/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01044 |
| Federal ID | IL01044 |
| More Info | State Dam Safety Program |