Greg Grimes Lake Dam Reservoir Report

Last Updated: December 5, 2025

Greg Grimes Lake Dam, located in Forsyth, Georgia, is a private earth dam designed by Ross Ulmer, P.E.


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Summary

The primary purpose of the dam is for recreation, with a normal storage capacity of 52 acre-feet and a maximum storage of 92.3 acre-feet. The dam has a hydraulic height of 18.6 feet and a hazard potential rated as low, with a moderate risk assessment score of 3.

The dam is associated with a nameless river or stream and falls under the jurisdiction of the Mobile District of the US Army Corps of Engineers. While the dam is privately owned and not regulated by the state, it is important for water resource and climate enthusiasts to note its existence as part of the overall water infrastructure in the area. The dam does not have a designated inspection frequency or condition assessment rating, indicating a need for further monitoring and evaluation to ensure its structural integrity and safety.

Despite its uncontrolled spillway and outlet gates, Greg Grimes Lake Dam provides recreational opportunities and adds to the surface area of the region, covering 7.4 acres. With its moderate risk assessment, this dam serves as a reminder of the importance of proper maintenance and monitoring of water infrastructure for both safety and environmental purposes in the face of changing climate conditions.

Dam Height

24.2

River Or Stream

Name unknown

Primary Dam Type

Earth

Surface Area

7.4

Hydraulic Height

18.6

Nid Storage

92.3

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

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.