County Line Impoundment is an earth dam located in Lyman County, South Dakota, built in 1992. It carries a Low hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 600 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 County Line Impoundment
The primary purpose of County Line Impoundment is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Usda Fs (federal). It impounds the Antelope Creek.
The dam stands 17 feet tall and stretches 600 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 96 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1992, the structure is 34 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 | Lyman |
| Nearest City | None |
| River/Stream | Antelope Creek |
| Coordinates | 44.18333, -100.36499 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 600 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 96 acre-ft |
| Max Storage | 96 acre-ft |
| Normal Storage | 42 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 1,090 cfs |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Usda Fs |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02329 |
| Federal ID | SD02329 |
| More Info | State Dam Safety Program |