Sonnenschein Number 2 is an earth dam located in Stanley County, South Dakota, built in 1963. It carries a Significant hazard potential classification.
Dam profile
NID height · 42 ft42 ft tall and 480 ft long, taller than 88% 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 Sonnenschein Number 2
The primary purpose of Sonnenschein Number 2 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 E. Sonnenschein (private). It impounds the Branch Willow Creek near Fort Pierre.
The dam stands 42 feet tall and stretches 480 feet across, and has a maximum storage capacity of 75 acre-feet. Completed in 1963, 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.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | South Dakota |
| County | Stanley |
| Nearest City | Fort Pierre |
| River/Stream | Branch Willow Creek |
| Coordinates | 44.42165, -100.55332 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 480 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 75 acre-ft |
| Max Storage | 75 acre-ft |
| Normal Storage | 16 acre-ft |
| Max Discharge | 806 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | E. Sonnenschein |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00255 |
| Federal ID | SD00255 |
| More Info | State Dam Safety Program |