Mueth Lake Dam is an earth dam located in St. Clair County, Illinois, built in 1997. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 380 ft long, taller than 68% 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 Mueth Lake Dam
The primary purpose of Mueth Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Joan Mueth (private). It impounds the Trib Prairie Du Long Creek.
The dam stands 30 feet tall and stretches 380 feet across, and has a maximum storage capacity of 291 acre-feet. Completed in 1997, the structure is 29 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 06/18/2025.
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Location
| State | Illinois |
| County | St. Clair |
| Nearest City | None |
| River/Stream | Trib Prairie Du Long Creek |
| Coordinates | 38.38362, -90.06698 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 380 ft |
| Year Completed | 1997 (29 years old) |
Storage & Hydraulics
| NID Storage | 291 acre-ft |
| Max Storage | 291 acre-ft |
| Normal Storage | 191 acre-ft |
| Max Discharge | 3 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Joan Mueth |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/18/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50299 |
| Federal ID | IL50299 |
| More Info | State Dam Safety Program |