Brost Number 4 Reservoir Report
Nearby: Brost Number 5 Brost Number 3
Last Updated: December 12, 2025
Brost Number 4 is a privately owned earth dam located in South Dakota, specifically in Jones County near the White River.
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Summary
Built in 1963, this dam has a height of 29 feet and a length of 420 feet, with a storage capacity of 27 acre-feet. It is regulated by the South Dakota Department of Environment and Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations. The dam has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment.
Despite its relatively low hazard potential, Brost Number 4 plays a significant role in water resource management and climate resilience in the region. With a maximum discharge capacity of 625 cubic feet per second, this dam helps regulate water flow in the White River, providing flood control and water supply benefits to the surrounding community. While the dam has not been rated for its condition assessment, its presence and functionality offer important support for local water resource management efforts. As a key infrastructure in the area, Brost Number 4 contributes to the overall resilience of the region in the face of changing climate conditions.
Year Completed |
1963 |
Dam Length |
420 |
Dam Height |
29 |
River Or Stream |
TR-WHITERIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
29 |
Nid Storage |
27 |
Hazard Potential |
Low |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
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 4