Gilliam Lake Dam Reservoir Report

Last Updated: December 5, 2025

Gilliam Lake Dam, located in Riegelwood, North Carolina, is a privately owned structure with a primary purpose of recreation.


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Summary

Built in 1949, this Earth-type dam stands at a structural height of 21.5 feet and has a hydraulic height of 10 feet. The dam boasts a normal storage capacity of 450 acre-feet and a maximum storage capacity of 540 acre-feet, providing ample water resources for recreational activities in the area.

The dam, situated on the Cape Fear River-Os, has a low hazard potential and is currently in fair condition as of its last assessment in 2013. Although not state regulated, it undergoes regular inspections to ensure its safety and integrity. The surrounding area offers a surface area of 40 acres for outdoor enthusiasts to enjoy, making it a popular destination for water resource and climate enthusiasts alike.

With its picturesque location and ample storage capacity, Gilliam Lake Dam serves as a vital recreational resource for the community. Its historical significance, coupled with its low hazard potential and fair condition, make it a valuable asset for both locals and visitors looking to experience the beauty of North Carolina's waterways.

Year Completed

1949

Dam Length

315

River Or Stream

Cape Fear River-Os

Primary Dam Type

Earth

Surface Area

40

Hydraulic Height

10

Nid Storage

540

Structural Height

21.5

Hazard Potential

Low

Nid Height

22
       
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.