Lake Herman Mip #2 is an earth dam located in Lake County, South Dakota, built in 1980. It carries a Low hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 980 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 Lake Herman Mip #2
The primary purpose of Lake Herman Mip #2 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Lake Co. Consv. Dist. (local government). It impounds the Tr-lake Herman.
The dam stands 21 feet tall and stretches 980 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 475 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1980, the structure is 46 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 | South Dakota |
| County | Lake |
| Nearest City | None |
| River/Stream | Tr-lake Herman |
| Coordinates | 43.96951, -97.19185 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 980 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 475 acre-ft |
| Max Storage | 475 acre-ft |
| Normal Storage | 290 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 1,096 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Lake Co. Consv. Dist. |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02181 |
| Federal ID | SD02181 |
| More Info | State Dam Safety Program |