Oak Mountain Old Lake Dam Reservoir Report

Last Updated: December 5, 2025

Oak Mountain Old Lake Dam, also known as Lake Tranquility, is a gravity dam located in NE Pelham, Alabama.


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Summary

Built in 1931, this historic structure serves primarily for flood risk reduction, with a hydraulic height of 50 feet and a structural height of 55 feet. The dam has a capacity of 1076 acre-feet, with a normal storage of 800 acre-feet. The dam is situated on TR Dry Brook and is under the jurisdiction of the state of Alabama.

Despite its age, Oak Mountain Old Lake Dam has a high hazard potential and has not been rated for its condition assessment. The dam does not have a state regulatory agency overseeing its operations, inspections, or enforcement. While it does not have an Emergency Action Plan (EAP) prepared or updated, the dam stands as a vital infrastructure for flood risk reduction in the area. With its serene surroundings and recreational opportunities, the dam is a significant landmark in the Shelby County, Alabama region for water resource and climate enthusiasts to explore and appreciate.

Year Completed

1931

Dam Length

136

River Or Stream

TR DRY BROOK

Primary Dam Type

Gravity

Hydraulic Height

50

Nid Storage

1076

Structural Height

55

Hazard Potential

High

Nid Height

55
       
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.