Tvinnereim Trust Dam is an earth dam located in Day County, South Dakota, built in 2015. It carries a Low hazard potential classification.
Dam profile
NID height · 8 ft8 ft tall and 400 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 Tvinnereim Trust Dam
The primary purpose of Tvinnereim Trust Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Irene J. Tvinnereim Irrevocable Trust (private). It impounds the Tr-unnamed Lake.
The dam stands 8 feet tall and stretches 400 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 280 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2015, the structure is relatively new.
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 | Day |
| River/Stream | Tr-unnamed Lake |
| Coordinates | 45.43477, -97.57764 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 400 ft |
| Year Completed | 2015 (11 years old) |
Storage & Hydraulics
| NID Storage | 280 acre-ft |
| Max Storage | 280 acre-ft |
| Normal Storage | 149 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 168 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Irene J. Tvinnereim Irrevocable Trust |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02654 |
| Federal ID | SD02654 |
| More Info | State Dam Safety Program |