Mclamb Dam Reservoir Report

Last Updated: December 5, 2025

Mclamb Dam, located in Harnett County, North Carolina, is a privately owned earth dam that serves primarily for irrigation purposes.


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Summary

The dam, with a structural height of 24 feet, impounds Thornton Creek-Os and has a storage capacity of 453.84 acre-feet. While the dam is not state-regulated, it has been inspected and deemed to be in fair condition as of July 2012.

Although Mclamb Dam does not have a spillway or outlet gates, it is classified as having a significant hazard potential. Despite its lack of state oversight, the dam has been inspected regularly, with the last assessment conducted in July 2012. With George Holding representing the area in Congress, the dam's role in providing irrigation water for agricultural purposes underscores its importance in the local water resource management.

While Mclamb Dam may not be as large or high-profile as some federally owned dams, its significance in providing water for irrigation cannot be understated. As climate change continues to impact water availability and quality, the maintenance and upkeep of dams like Mclamb will be crucial in ensuring a sustainable water supply for agricultural operations in the region.

River Or Stream

Thornton Creek-Os

Primary Dam Type

Earth

Nid Storage

453.84

Structural Height

24

Hazard Potential

Significant

Nid Height

24
       
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.