Dewar Lake Dam Reservoir Report

Last Updated: December 5, 2025

Dewar Lake Dam, located in Lillington, North Carolina, is a private-owned structure primarily used for irrigation purposes.


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Summary

Built in 1951, this earth dam stands at a structural height of 12 feet with a hydraulic height of 8 feet, stretching 480 feet in length. The dam has a storage capacity of 77 acre-feet, providing water for irrigation, recreation, and water supply in the area. Avents Creek serves as the river or stream source for the dam.

Despite being privately owned, Dewar Lake Dam is subject to state inspection, ensuring its structural integrity and safety. The dam has not been rated for its condition assessment, indicating the need for further evaluation. With a significant hazard potential, the dam is closely monitored for any risks or safety concerns. The last inspection of Dewar Lake Dam took place in March 2001, highlighting the importance of regular maintenance and assessment to prevent any potential hazards.

As a crucial water resource in Harnett County, Dewar Lake Dam plays a vital role in providing water for irrigation and other essential purposes. The dam's location in a high-risk area emphasizes the need for effective risk management measures and emergency preparedness. Despite not being federally regulated, Dewar Lake Dam's significance in water supply and irrigation highlights the importance of maintaining its structural integrity and safety for the surrounding community and ecosystem.

Year Completed

1951

Dam Length

480

River Or Stream

Avents Creek

Primary Dam Type

Earth

Surface Area

17

Hydraulic Height

8

Drainage Area

83

Nid Storage

77

Structural Height

12

Hazard Potential

Significant

Nid Height

12
       
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.