Lagg Lake 2 is an earth dam located in Jefferson County, Illinois, built in 1976. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 825 ft long, taller than 74% 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 Lagg Lake 2
The primary purpose of Lagg Lake 2 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Michel (private). It impounds the Trib Casey Fork near Idlewood.
The dam stands 32 feet tall and stretches 825 feet across, and has a maximum storage capacity of 799 acre-feet. Completed in 1976, the structure is 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 06/02/2025.
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Location
| State | Illinois |
| County | Jefferson |
| Nearest City | Idlewood |
| River/Stream | Trib Casey Fork |
| Coordinates | 38.42331, -88.89809 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 825 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 799 acre-ft |
| Max Storage | 799 acre-ft |
| Normal Storage | 561 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Michel |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/02/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00949 |
| Federal ID | IL00949 |
| More Info | State Dam Safety Program |