Brost Number 3 Reservoir Report
Nearby: Brost Number 4 Brost Number 5
Last Updated: December 13, 2025
Brost Number 3, located in Jones, South Dakota, is a privately-owned dam that serves as a vital water resource in the area.
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Summary
Built in 1959 by the Natural Resources Conservation Service, this earth dam stands at 27 feet high and spans 303 feet in length, with a storage capacity of 44 acre-feet. It is situated on the TR-Whiteriver, under the regulation of the South Dakota Department of Environment and Natural Resources.
Despite being classified as a low hazard potential structure, Brost Number 3 meets state regulatory standards for inspection, permitting, and enforcement. The dam has a maximum discharge capacity of 450 cubic feet per second and a normal storage capacity of 36 acre-feet. While its condition is currently not rated, the dam has not undergone any modifications since its completion, indicating a relatively stable operation over the years.
With its location in a picturesque setting along the Whiteriver, Brost Number 3 is a key component of the local water infrastructure. Enthusiasts of water resources and climate will find this structure intriguing for its historical significance, engineering design, and role in ensuring water supply and management in South Dakota.
Year Completed |
1959 |
Dam Length |
303 |
Dam Height |
27 |
River Or Stream |
TR-WHITERIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
44 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
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Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Brost Number 3