Pactola Dike 2 Reservoir Report

Last Updated: December 5, 2025

Pactola Dike 2, located in South Dakota along Rapid Creek, is a vital structure designed by the Bureau of Reclamation for flood risk reduction.


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Summary

Completed in 1959, this Earth dam stands at a height of 115 feet and has a hydraulic height of 146 feet. With a capacity to store 140,898 acre-feet of water, it serves multiple purposes including fish and wildlife pond, irrigation, recreation, and water supply.

Managed and regulated by the Bureau of Reclamation, Pactola Dike 2 plays a crucial role in safeguarding the surrounding area from potential flood hazards. Its location in Pennington County, close to the city of HIGESA, highlights its significance in protecting the community and environment. Despite its high hazard potential, the dam's condition assessment is not available, emphasizing the need for ongoing monitoring and maintenance to ensure its continued effectiveness in flood risk mitigation.

With a maximum discharge capacity of 255,000 cubic feet per second, Pactola Dike 2 is a key asset in water resource management in the region. Its association with other structures further underscores its importance in the overall water infrastructure. As climate change continues to pose challenges to water resources, the role of structures like Pactola Dike 2 in flood control and mitigation becomes increasingly crucial for the resilience of the community and the environment.

Year Completed

1959

Dam Length

1157

Dam Height

115

River Or Stream

RAPID CREEK

Primary Dam Type

Earth

Surface Area

1557

Hydraulic Height

146

Drainage Area

229

Nid Storage

140898

Structural Height

150

Hazard Potential

High

Nid Height

150
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.