Gentry Reservoir Report

Last Updated: December 11, 2025

Gentry, also known as Gentry Dam, is a private structure located in Williamson, Tennessee along the TRIBWEST HARPETH RIVER.


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Summary

Built in 1965 by the USDA NRCS, this Earth-type dam serves primarily for Fish and Wildlife Pond purposes, while also providing benefits for Fire Protection, Stock, Small Fish Pond, and Recreation. With a hydraulic height of 10.5 feet and a structural height of 17.5 feet, Gentry has a storage capacity of 95 acre-feet and covers a surface area of 7 acres within a drainage area of 0.71 square miles.

Despite being categorized as having a Low hazard potential, Gentry has not been rated for its condition assessment. The last inspection conducted was in April 2018, with a scheduled inspection frequency of 5 years. The risk assessment for Gentry is considered to be Moderate (3), indicating a moderate level of potential risk associated with the dam. While no Emergency Action Plan (EAP) has been prepared, the dam has not been deemed to meet guidelines for EAP readiness, and there are no inundation maps currently in place. Overall, Gentry represents an important structure within the water resource management landscape of Tennessee, serving multiple purposes while warranting ongoing monitoring and risk management measures.

Year Completed

1965

Dam Length

196.1

River Or Stream

TRIBWEST HARPETH RIVER

Primary Dam Type

Earth

Surface Area

7

Hydraulic Height

10.5

Drainage Area

0.71

Nid Storage

95

Structural Height

17.5

Outlet Gates

None

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

18
       
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.