Hamilton Mortgage Dam Reservoir Report

Last Updated: December 5, 2025

Hamilton Mortgage Dam, located in Cobb, Georgia, is a private earth dam primarily used for recreation purposes.


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Summary

With a height of 27.4 feet and a hydraulic height of 19.4 feet, this dam provides a storage capacity of 16 acre-feet and covers a surface area of 1.5 acres. Despite being uncontrolled, the dam has a low hazard potential and a moderate risk assessment rating.

While the dam's condition assessment is marked as "Not Rated" and its last inspection took place in 2005, the structure still meets regulatory requirements and is inspected every five years. The dam's emergency action plan status is unknown, and there is no information available on its risk management measures or inundation maps. Despite these uncertainties, Hamilton Mortgage Dam remains a notable feature in the region, attracting water resource and climate enthusiasts interested in its design and recreational opportunities.

Dam Length

225

Dam Height

27.4

River Or Stream

UNKNOWN

Primary Dam Type

Earth

Surface Area

1.5

Hydraulic Height

19.4

Drainage Area

50

Nid Storage

16

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

27
       
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.