Billy Cox Upper Dam Reservoir Report

Last Updated: December 15, 2025

Billy Cox Upper Dam, also known as W H Cox Dam 2, is a privately-owned earth dam located in Williamsburg, South Carolina.


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Summary

Completed in 1965, this dam serves primarily for recreation purposes and stands at a height of 7 feet with a length of 325 feet. With a storage capacity of 74 acre-feet, the dam is situated on the TR-JUNE BRANCH river or stream and is under the regulatory oversight of the South Carolina Department of Health and Environmental Control.

Despite its low hazard potential, Billy Cox Upper Dam is currently assessed to be in poor condition as of the last inspection in November 2017. The dam's emergency action plan status is unclear, and there are no inundation maps prepared or risk management measures in place. The dam's primary purpose for recreation highlights the importance of ensuring its structural integrity and safety for both the surrounding community and the environment. Water resource and climate enthusiasts may find interest in monitoring the maintenance and potential upgrades of Billy Cox Upper Dam to mitigate any risks associated with its condition.

Year Completed

1965

Dam Length

325

Dam Height

7

River Or Stream

TR-JUNE BRANCH

Primary Dam Type

Earth

Surface Area

10

Nid Storage

74

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

7
       
Seasonal Comparison

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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.