Fiber Lake Dam Reservoir Report

Last Updated: December 5, 2025

Fiber Lake Dam, also known as Kosa Dam, is a privately owned earth dam located in Spencer, North Carolina.


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Summary

Completed in 1966, this dam serves primarily for recreational purposes, providing a storage capacity of 64 acre-feet and a normal storage level of 53 acre-feet. With a hydraulic height of 15 feet and a structural height of 23 feet, Fiber Lake Dam spans 375 feet in length and covers a surface area of 6 acres.

Situated on Withrow Creek-Os, Fiber Lake Dam is under the jurisdiction of Rowan County and is inspected regularly for safety compliance. Despite its low hazard potential and the lack of a current condition assessment, this dam plays a crucial role in managing water resources and supporting recreational activities in the region. Although not regulated by the state, its presence contributes to the overall water infrastructure and environmental conservation efforts in the area.

With its picturesque location and historical significance, Fiber Lake Dam stands as a testament to the importance of water resource management and climate resilience. As water enthusiasts and climate advocates, understanding the role of dams like Fiber Lake in sustaining ecosystems and providing recreational opportunities is essential for promoting sustainable practices and ensuring the long-term health of our waterways.

Year Completed

1966

Dam Length

375

River Or Stream

Withrow Creek-Os

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

15

Drainage Area

77

Nid Storage

64

Structural Height

23

Hazard Potential

Low

Nid Height

23
       
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.