Cooper Dev - East Dike Reservoir Report

Last Updated: December 15, 2025

Cooper Dev - East Dike, also known as Pinopolis East Dike, is a critical structure located in Berkeley, South Carolina, along the Cooper River.


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Summary

Built in 1942 by the Harza Engineering Company, this earth dam stands at a height of 25 feet and serves multiple purposes, including flood risk reduction, hydroelectric power generation, navigation, recreation, and water supply. With a normal storage capacity of 1,110,000 acre-feet and a surface area of 60,000 acres, this dam plays a vital role in managing the water resources in the region.

Managed by the Federal Energy Regulatory Commission, Cooper Dev - East Dike has a high hazard potential and poses significant risks if not properly maintained. While the condition assessment is currently not available, the emergency action plan was last revised in January 2021 to ensure preparedness in case of emergencies. The dam has three associated structures and is inspected annually to monitor its safety and integrity. Despite not being under state jurisdiction, this dam remains crucial for flood protection and water management in the area.

Cooper Dev - East Dike serves as a key infrastructure for mitigating flood risks and supporting various water-related activities in South Carolina. With its historical significance and ongoing efforts to ensure safety and resilience, this dam stands as a testament to the importance of effective water resource management and climate adaptation strategies. Enthusiasts and stakeholders alike can appreciate the intricate design and critical role that Cooper Dev - East Dike plays in sustaining the local ecosystem and community well-being.

Year Completed

1942

Dam Length

30624

Dam Height

25

River Or Stream

Cooper

Primary Dam Type

Earth

Surface Area

60000

Hydraulic Height

36

Nid Storage

1110000

Structural Height

36

Hazard Potential

High

Foundations

Soil

Nid Height

36
       
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.