Brost Number 9 Reservoir Report
Nearby: Wedean Number 1 Esmay And Sandy #2
Last Updated: December 7, 2025
Brost Number 9 is a privately owned dam located in South Dakota, specifically in Jones County, along the TR-White River.
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Summary
Constructed in 1955, this earth dam stands at a height of 32 feet with a length of 534 feet, providing a storage capacity of 89 acre-feet. The dam is under state regulation by the South Dakota Department of Environment and Natural Resources (DENR), with permits, inspections, and enforcement in place to ensure its safety and compliance.
Managed by the Natural Resources Conservation Service, Brost Number 9 is classified as a low hazard potential structure with a "Not Rated" condition assessment. Despite its age, the dam has not been modified in recent years and has not undergone a formal risk assessment or emergency action plan preparation. The dam's emergency response preparedness and risk management measures are currently not documented, indicating a need for further evaluation and planning in case of potential hazards or emergencies. While the dam's condition is not actively monitored, its regulatory oversight provides some level of assurance for water resource and climate enthusiasts interested in its operation and safety.
Year Completed |
1955 |
Dam Length |
534 |
Dam Height |
32 |
River Or Stream |
TR-WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
32 |
Nid Storage |
89 |
Hazard Potential |
Low |
Nid Height |
32 |
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 9