Mollison Dam is an earth dam located in Hughes County, South Dakota, built in 2000. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 226 ft long, taller than 74% 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 Mollison Dam
The primary purpose of Mollison Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Susan Mollison (private). It impounds the Tr Medicine Creek.
The dam stands 32 feet tall and stretches 226 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 140 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 2000, the structure is 26 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 09/24/2001. That was over 25 years ago.
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Location
| State | South Dakota |
| County | Hughes |
| Nearest City | None |
| River/Stream | Tr Medicine Creek |
| Coordinates | 44.38826, -100.08630 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 226 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Normal Storage | 78 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,350 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Susan Mollison |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/24/2001 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02480 |
| Federal ID | SD02480 |
| More Info | State Dam Safety Program |