Boyle Investment Lake Reservoir Report

Last Updated: December 6, 2025

Boyle Investment Lake, located in Shelby, Tennessee, is a private earth dam structure on the TRIBWOLF RIVER with a hydraulic height of 19.6 feet and a structural height of 24 feet.


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Summary

Completed in 1948, the dam has a storage capacity of 222 acre-feet and a surface area of 17.8 acres. With a significant hazard potential and a moderate risk assessment rating of 3, this uncontrolled spillway dam poses a potential risk to the surrounding area.

Despite not being regulated or inspected by the state, Boyle Investment Lake remains an important water resource in the Germantown area. The dam has a normal storage capacity of 140 acre-feet and a drainage area of 0.11 square miles. While the condition assessment is marked as "Not Rated," the last inspection in May 2018 revealed no specific concerns. With no outlet gates and no associated structures, the dam's emergency action plan status and risk management measures remain unspecified.

As a popular spot for water and climate enthusiasts, Boyle Investment Lake offers a serene environment for outdoor activities and wildlife observation. With its historical significance dating back to the mid-20th century, the dam serves as a reminder of the importance of water resource management and the need for ongoing monitoring and maintenance to ensure the safety of the community and surrounding areas.

Year Completed

1948

Dam Length

1300

River Or Stream

TRIBWOLF RIVER

Primary Dam Type

Earth

Surface Area

17.8

Hydraulic Height

19.6

Drainage Area

0.11

Nid Storage

222

Structural Height

24

Outlet Gates

None

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.