Koster Dam
Koster Dam is an earth dam located in Walworth County, South Dakota, built in 1971. It carries a Low hazard potential classification.
About Koster Dam
The primary purpose of Koster Dam 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 Koster (private). It impounds the Trib-missouri.
The dam stands 26 feet tall and stretches 550 feet across, and has a maximum storage capacity of 20 acre-feet. Completed in 1971, 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.
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Location
| State | South Dakota |
| County | Walworth |
| River/Stream | Trib-missouri |
| Coordinates | 45.43333, -99.84332 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 550 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 20 acre-ft |
| Max Storage | 20 acre-ft |
| Normal Storage | 16 acre-ft |
| Max Discharge | 1,500 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | JOHN KOSTER |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00749 |
| Federal ID | SD00749 |
| More Info | State Dam Safety Program |