Niemi No.4 is an earth dam located in Harding County, South Dakota, built in 1954. It carries a Significant hazard potential classification.
Dam profile
NID height · 19 ft19 ft tall and 300 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 Niemi No.4
The primary purpose of Niemi No.4 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 John Niemi (private). It impounds the Sheep Creek.
The dam stands 19 feet tall and stretches 300 feet across, and has a maximum storage capacity of 61 acre-feet. Completed in 1954, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
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Location
| State | South Dakota |
| County | Harding |
| River/Stream | Sheep Creek |
| Coordinates | 45.63474, -103.52630 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 300 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 61 acre-ft |
| Max Storage | 61 acre-ft |
| Normal Storage | 48 acre-ft |
| Max Discharge | 630 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | John Niemi |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00623 |
| Federal ID | SD00623 |
| More Info | State Dam Safety Program |