Cobb Lake Dam Reservoir Report

Last Updated: December 5, 2025

Cobb Lake Dam, also known as Bear Creek W/S Dam #12, is a private dam located in Lagrange, North Carolina.


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Summary

Built in 1962 by the USDA NRCS, this earth dam stands at a height of 16.2 feet, with a hydraulic height of 7.6 feet, and spans 650 feet in length. It serves the primary purpose of flood risk reduction and offers recreational opportunities as well.

With a storage capacity of 900 acre-feet and a normal storage level of 179 acre-feet, Cobb Lake Dam plays a crucial role in managing water resources in the region. The dam, constructed with stone core types and soil foundations, has a low hazard potential and a moderate risk assessment. While it has not been rated for its condition since 2008, the dam is inspected periodically to ensure its safety and functionality.

Situated on Hullett Branch and surrounded by a drainage area of 2048 acres, Cobb Lake Dam is a vital infrastructure that helps in flood control and water supply management. Its uncontrolled spillway and outlet gates add to its operational efficiency, while its location in Greene County offers a picturesque setting for recreational activities. Despite being privately owned, the dam is a significant asset in enhancing water security and climate resilience in the area.

Year Completed

1962

Dam Length

650

River Or Stream

Hullett Branch

Primary Dam Type

Earth

Surface Area

59

Hydraulic Height

7.6

Drainage Area

2048

Nid Storage

900

Structural Height

16.2

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

16
       
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.