New Underwood Land Partners Dam is an earth dam located in Pennington County, South Dakota, built in 1986. It carries a Low hazard potential classification.
Dam profile
NID height · 14 ft14 ft tall and 170 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 New Underwood Land Partners Dam
The primary purpose of New Underwood Land Partners Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by New Underwood Land Partners (private). It impounds the Trib. Boxelder Creek.
The dam stands 14 feet tall and stretches 170 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 120 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1986, the structure is 40 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 06/08/1987. That was over 39 years ago.
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Location
| State | South Dakota |
| County | Pennington |
| Nearest City | None |
| River/Stream | Trib. Boxelder Creek |
| Coordinates | 44.10499, -102.86666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 170 ft |
| Year Completed | 1986 (40 years old) |
Storage & Hydraulics
| NID Storage | 120 acre-ft |
| Max Storage | 120 acre-ft |
| Normal Storage | 60 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 3,000 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | New Underwood Land Partners |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/08/1987 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02252 |
| Federal ID | SD02252 |
| More Info | State Dam Safety Program |