Dykstra Number 9 is an earth dam located in Jones County, South Dakota, built in 1961. It carries a Low hazard potential classification.
Dam profile
NID height · 34 ft34 ft tall and 357 ft long, taller than 78% 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 Dykstra Number 9
The primary purpose of Dykstra Number 9 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 Daum Brothers (private). It impounds the Tr-white River.
The dam stands 34 feet tall and stretches 357 feet across, and has a maximum storage capacity of 46 acre-feet. Completed in 1961, the structure is well into its service life at over 50 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.
At 34 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | South Dakota |
| County | Jones |
| Nearest City | None |
| River/Stream | Tr-white River |
| Coordinates | 43.80499, -100.79499 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 357 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 46 acre-ft |
| Max Storage | 46 acre-ft |
| Normal Storage | 35 acre-ft |
| Max Discharge | 600 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Daum Brothers |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00120 |
| Federal ID | SD00120 |
| More Info | State Dam Safety Program |