Harrells Millpond Dam Reservoir Report

Last Updated: December 6, 2025

Harrells Millpond Dam, located in Darlington, South Carolina, stands as a testament to water resource management and climate resilience.


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Summary

Built in 1940, this private earth dam serves multiple purposes, including recreation and water storage. With a height of 5 feet and a length of 275 feet, the dam holds a maximum storage capacity of 170 acre-feet, providing essential water resources for the surrounding area.

Managed by the South Carolina Department of Health and Environmental Control, Harrells Millpond Dam is subject to regular inspections and enforcement to ensure its structural integrity and safety. Despite being rated as having a fair condition assessment, the dam presents a significant hazard potential due to its age and the surrounding area's susceptibility to extreme weather events. Emergency action plans are in place, although they may need updating to meet current guidelines.

With its association with the Boggy Gully Swamp and proximity to the Wilmington District, Harrells Millpond Dam stands as a vital piece of infrastructure in the region's water resource management efforts. Its historical significance, coupled with its ongoing maintenance and regulation, highlights the importance of sustainable dam management practices in the face of changing climate conditions.

Year Completed

1940

Dam Length

275

Dam Height

5

River Or Stream

BOGGY GULLY SWAMP

Primary Dam Type

Earth

Surface Area

34

Nid Storage

170

Hazard Potential

Significant

Foundations

Soil

Nid Height

5
       
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.