Harp's Lake Dam Reservoir Report

Last Updated: December 5, 2025

Located in Henry, Georgia, Harp's Lake Dam is a private-owned earth dam primarily used for recreation purposes.


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Summary

Standing at 18 feet in height and spanning 306 feet in length, this dam boasts a storage capacity of 77 acre-feet and covers a surface area of 12 acres. Despite being unregulated by the state and lacking official inspections, the dam has a low hazard potential and a moderate risk assessment rating.

Situated within the Mobile District, Harp's Lake Dam features an uncontrolled spillway and outlet gates. While the dam's condition remains unrated, its risk management measures and emergency preparedness guidelines are currently unspecified. With a moderate risk assessment score of 3, the dam presents a manageable level of risk, providing ample opportunity for water resource and climate enthusiasts to explore and enjoy the recreational opportunities offered by this unique structure in Georgia's scenic landscape.

From its unknown designer to the absence of state jurisdiction and regulatory oversight, Harp's Lake Dam stands as a testament to the intersection of human ingenuity and natural beauty. With its low hazard potential and moderate risk assessment, this private-owned earth dam offers a captivating destination for those interested in water resources and climate dynamics. As visitors traverse the 306-foot expanse and contemplate the 77 acre-feet of storage capacity, they are sure to be drawn in by the allure of this recreational haven in the heart of Henry County, Georgia.

Dam Length

306

Dam Height

18

River Or Stream

UNKNOWN

Primary Dam Type

Earth

Surface Area

12

Drainage Area

636

Nid Storage

77

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

18
       
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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.