Brost Number 1 is an earth dam located in Jones County, South Dakota, built in 1959. It carries a Significant hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 500 ft long, taller than 74% 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 Brost Number 1
The primary purpose of Brost Number 1 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 Herman Brost (private). It impounds the Tr-white River.
The dam stands 32 feet tall and stretches 500 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 200 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1959, 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. The most recent inspection on record was 11/14/1981. That was over 44 years ago.
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Location
| State | South Dakota |
| County | Jones |
| Nearest City | None |
| River/Stream | Tr-white River |
| Coordinates | 43.77333, -100.82832 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 500 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 200 acre-ft |
| Max Storage | 200 acre-ft |
| Normal Storage | 130 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,222 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Herman Brost |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/14/1981 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00148 |
| Federal ID | SD00148 |
| More Info | State Dam Safety Program |