Marshall Lake Dam Reservoir Report
Nearby: Bean Lake Dam Abercrombie Lake Dam
Last Updated: December 6, 2025
Marshall Lake Dam in Thomaston, Georgia, is a private earth dam standing at a height of 44 feet and stretching 440 feet in length.
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Summary
With a storage capacity of 550 acre-feet, the dam serves a critical role in water resource management in the region. Despite its low hazard potential and moderate risk assessment, the dam has not been rated for its current condition, highlighting the need for regular inspections and maintenance to ensure its long-term safety and effectiveness.
Designed by F. Flournoy, Marshall Lake Dam does not fall under federal regulation or permitting. However, it is subject to state jurisdiction and inspection, with the last inspection conducted in June 2018. The dam features an uncontrolled spillway and outlet gates, emphasizing the importance of emergency preparedness and risk management measures. With its location in Upson County and proximity to the Savannah District, the dam plays a vital role in sustaining the local ecosystem and water supply, making it a focal point for water resource and climate enthusiasts.
As climate change continues to impact water resources and infrastructure, Marshall Lake Dam serves as a reminder of the importance of proactive monitoring and maintenance to mitigate potential risks. With its strategic location and storage capacity, the dam plays a crucial role in flood control and water storage for the surrounding area. By staying informed and engaged in the management of dams like Marshall Lake, enthusiasts can contribute to the sustainable stewardship of water resources in the face of evolving climate challenges.
Dam Length |
440 |
Dam Height |
44 |
Primary Dam Type |
Earth |
Surface Area |
23 |
Nid Storage |
550 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
44 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Flint River Near Culloden
|
1200cfs |
Tobesofkee Creek Near Macon
|
499cfs |
Shoal Creek At Shoal Creek Rd
|
17cfs |
Flint River Near Griffin
|
163cfs |
Falling Creek Near Juliette
|
20cfs |
Ocmulgee River At Macon
|
1910cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Marshall Lake Dam