Brost Number 8 Reservoir Report
Nearby: Rankin Number 2 Brost Number 7
Last Updated: December 8, 2025
Brost Number 8, located in Jones, South Dakota, is a privately owned earth dam completed in 1956 with a height of 26 feet and a length of 372 feet.
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Summary
The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and is used for flood control purposes along the TR-WHITERIVER. With a low hazard potential and a condition assessment of "Not Rated," Brost Number 8 has a maximum storage capacity of 23 acre-feet and a normal storage capacity of 15 acre-feet.
Managed by the Natural Resources Conservation Service, Brost Number 8 has not been rated for emergency preparedness or risk assessment. The dam has a maximum discharge capacity of 487 cubic feet per second and has not been inspected recently. The dam is located within the jurisdiction of the St. Paul District of the US Army Corps of Engineers, with oversight from Congressman Dusty Johnson. Water resource and climate enthusiasts may find Brost Number 8 an interesting case study for private dam management and regulation in South Dakota.
Year Completed |
1956 |
Dam Length |
372 |
Dam Height |
26 |
River Or Stream |
TR-WHITERIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
23 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
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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 8