Pastnot Ratede 9 Dam Reservoir Report
Last Updated: December 6, 2025
Pastnot Ratede 9 Dam, located in Perkins County, South Dakota, is a privately owned structure that serves as a vital component in managing water resources in the area.
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Summary
Completed in 1995, this earth dam stands at a height of 22 feet and has a storage capacity of 148 acre-feet. Situated on a tributary of the Grand River, the dam plays a crucial role in flood control and water supply management, with a maximum discharge capacity of 1350 cubic feet per second.
Despite its importance, Pastnot Ratede 9 Dam has not been rated for its condition, indicating a potential need for further assessment and maintenance. However, its hazard potential is classified as low, providing a sense of security for the surrounding community. With state regulation, inspection, and enforcement in place, the dam is monitored to ensure its safety and efficiency in water resource management. Additionally, the dam's location within the St. Paul District of the US Army Corps of Engineers adds another layer of oversight and support for its operation.
As a significant infrastructure for water resource management in South Dakota, Pastnot Ratede 9 Dam stands as a testament to the importance of maintaining and monitoring dams for the protection of communities and ecosystems. Its role in flood control, water supply, and overall environmental management highlights the interconnectedness of water resources and climate resilience. With continued oversight and maintenance, this dam will continue to play a vital role in sustaining the region's water resources for years to come.
Year Completed |
1995 |
Dam Length |
1055 |
Dam Height |
22 |
River Or Stream |
TRIB. GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Drainage Area |
1 |
Nid Storage |
148 |
Hazard Potential |
Low |
Nid Height |
22 |
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.
Pastnot Ratede 9 Dam