Pearl Ross Reservoir Report
Nearby: Johnson Bros. Dell Oliver
Last Updated: December 6, 2025
Pearl Ross, a privately owned dam in Perkins, South Dakota, is regulated by the South Dakota Department of Environment and Natural Resources.
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Summary
Constructed in 1956, this earth dam stands at a height of 20 feet and has a length of 500 feet, with a storage capacity of 72 acre-feet. Situated on the TR South Grand River, Pearl Ross plays a crucial role in water resource management in the area, with a maximum discharge capacity of 150 cubic feet per second.
Managed by the Natural Resources Conservation Service, Pearl Ross has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. Despite not having a designated emergency action plan, the dam continues to be inspected, with regular maintenance and enforcement measures in place to ensure its structural integrity and safety. With its strategic location and importance in flood control and water supply, Pearl Ross remains a significant asset in the region's water resource and climate resilience efforts.
While Pearl Ross may not have had recent modifications or updates, its historical significance and ongoing regulatory oversight highlight its importance in the local water management infrastructure. As climate change continues to impact water resources, the maintenance and monitoring of dams like Pearl Ross are crucial in ensuring the safety and sustainability of water supply systems in South Dakota. Enthusiasts and stakeholders invested in water resources and climate resilience can appreciate the role that Pearl Ross plays in safeguarding the community against potential hazards and promoting sustainable water management practices.
Year Completed |
1956 |
Dam Length |
500 |
Dam Height |
20 |
River Or Stream |
TR SOUTH GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
72 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Pearl Ross