Mann Lake Dam is an earth dam located in Massac County, Illinois, built in 1960. It carries a Low hazard potential classification.
Dam profile
NID height · 24 ft24 ft tall and 490 ft long. 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 Mann Lake Dam
The primary purpose of Mann Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Donna Weaver & James Mann (private). It impounds the Trib Barren Creek near Bay City.
The dam stands 24 feet tall and stretches 490 feet across, and has a maximum storage capacity of 153 acre-feet. Completed in 1960, 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 04/27/2022.
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Location
| State | Illinois |
| County | Massac |
| Nearest City | Bay City |
| River/Stream | Trib Barren Creek |
| Coordinates | 37.21975, -88.57139 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 490 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 153 acre-ft |
| Max Storage | 153 acre-ft |
| Normal Storage | 120 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Donna Weaver & James Mann |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 04/27/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00070 |
| Federal ID | IL00070 |
| More Info | State Dam Safety Program |