Allen Blalock Dam Reservoir Report

Last Updated: December 5, 2025

Allen Blalock Dam, located in Edgefield, South Carolina, is a privately-owned structure built in 1993 by the USDA NRCS.


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Summary

This earth dam stands at 28 feet tall and stretches 325 feet in length, providing crucial fire protection and serving as a pond for small fish and livestock. With a storage capacity of 98 acre-feet, the dam is primarily regulated by the South Carolina Department of Health and Environmental Control and undergoes regular inspections to ensure its safety and functionality.

Despite its low hazard potential, the dam's condition assessment is rated as poor, indicating a need for maintenance and potential upgrades. The risk assessment for Allen Blalock Dam is classified as moderate, highlighting the importance of implementing risk management measures to mitigate any potential threats. Although the dam is uncontrolled, efforts are underway to ensure that emergency action plans are in place and meet regulatory guidelines. Enthusiasts of water resources and climate will find Allen Blalock Dam to be a fascinating case study in dam construction and regulation in South Carolina.

Year Completed

1993

Dam Length

325

Dam Height

28

River Or Stream

TR-LLOYD CREEK

Primary Dam Type

Earth

Surface Area

7

Nid Storage

98

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

28
       
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.