St. Mario Country Club Lake Dam #3a Reservoir Report

Last Updated: December 5, 2025

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Summary

Mario Country Club Lake Dam #3a, located in Forsyth, Georgia, is a privately owned earthen dam completed in 1992 with a height of 29 feet and a length of 150 feet. The dam has a storage capacity of 332 acre-feet and serves as a recreational lake for the country club. The dam is classified as having an uncontrolled spillway and outlet gates, with a moderate hazard potential.

Despite being a privately owned structure, the dam is subject to state jurisdiction and inspection, with the last inspection conducted in August 2016. The risk assessment for St. Mario Country Club Lake Dam #3a has been rated as moderate, indicating the need for ongoing monitoring and potential risk management measures. With its location in the Savannah District of the USACE, the dam plays a crucial role in water resource management in the area and underscores the importance of maintaining and assessing dam safety in the face of changing climate conditions.

Year Completed

1992

Dam Length

150

Dam Height

29

Primary Dam Type

Earth

Surface Area

4

Nid Storage

332

Outlet Gates

Uncontrolled

Hazard Potential

Undetermined

Foundations

Unlisted/Unknown

Nid Height

29
       
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.