Mann Lake Dam is an earth dam located in Shelby County, Missouri, built in 1977. It carries a Low hazard potential classification.
Dam profile
NID height · 22 ft22 ft tall. 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 debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Leslie Mann (private). It impounds the Tr to Garnett Branch near Bethel.
The dam stands 22 feet tall, creates a reservoir covering 9 acres, has a maximum storage capacity of 106 acre-feet, and collects water from a drainage area of 62 square miles. Completed in 1977, the structure is 49 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.
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Location
| State | Missouri |
| County | Shelby |
| Nearest City | Bethel |
| River/Stream | Tr to Garnett Branch |
| Coordinates | 39.93173, -92.08594 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 106 acre-ft |
| Max Storage | 106 acre-ft |
| Normal Storage | 54 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 62 sq mi |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Leslie Mann |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO11397 |
| Federal ID | MO11397 |
| More Info | State Dam Safety Program |