Brook Hollow Lake Dam Reservoir Report

Last Updated: December 5, 2025

Brook Hollow Lake Dam, located in Gwinnett, Georgia, was completed in 1985 with a primary purpose of flood risk reduction.


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Summary

This private dam, designed by Pharr Engineering, is an earth dam with a buttress core type, standing at 34 feet in height with a hydraulic height of 25 feet. The dam has a storage capacity of 63 acre-feet and a normal storage of 24 acre-feet, serving a drainage area of 89 square miles.

Despite being state-regulated and inspected, the dam is classified with a low hazard potential and a moderate risk assessment. With an uncontrolled spillway and outlet gates, the dam's condition remains unrated as of the last inspection in October 2016. Even though the dam meets guidelines and has not experienced any emergency situations, water resource and climate enthusiasts may find interest in the risk management measures and potential enhancements that could further ensure the safety and efficiency of Brook Hollow Lake Dam for the surrounding community and environment.

Year Completed

1985

Dam Length

300

Dam Height

34

River Or Stream

UNKNOWN

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

25

Drainage Area

89

Nid Storage

63

Structural Height

25

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

34
       
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.