Mcquillan Reservoir Report

Last Updated: December 5, 2025

Mcquillan, located in Grundy, Tennessee, is a private dam primarily used for recreation purposes.


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Summary

With a structural height of 20 feet and a length of 400 feet, it stands as a significant structure on the Stonequarry Creek. The dam has a storage capacity of 125 acre-feet and covers a surface area of 13.3 acres, serving as a popular spot for outdoor activities in the area.

Although Mcquillan is not regulated by the state, it is classified as having a significant hazard potential, emphasizing the importance of regular inspections and maintenance. The last inspection in September 2018 rated its condition as "Not Rated", indicating a need for further assessment. Despite its moderate risk level, there are currently no emergency action plans or inundation maps in place for the dam.

For water resource and climate enthusiasts, Mcquillan presents an interesting case study in dam management and safety. Its unique location and recreational purpose highlight the intersection of human activities with natural water systems, underscoring the need for sustainable practices to ensure the safety and integrity of such structures in the face of changing environmental conditions.

Dam Length

400

River Or Stream

STONEQUARRY CREEK

Primary Dam Type

Earth

Surface Area

13.3

Drainage Area

0.3

Nid Storage

125

Structural Height

20

Outlet Gates

None

Hazard Potential

Significant

Nid Height

20
       
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.
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