Thomason Lake Dam Reservoir Report
Last Updated: December 13, 2025
Thomason Lake Dam, located in Dallas, Georgia, is a private-owned structure primarily used for recreation purposes along the Lane Creek.
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Summary
This earth dam, with a height of 28.3 feet and a storage capacity of 96 acre-feet, serves as a low-hazard potential facility with a moderate risk assessment rating. The dam's design includes an uncontrolled spillway and outlet gates, contributing to its operational functionality for maintaining water levels and safety standards.
While Thomason Lake Dam is not regulated by the state, it undergoes inspections every five years, with the last assessment conducted in July 2018. Despite being classified as "Not Rated" in terms of condition assessment, the dam continues to serve its purpose effectively. With a moderate risk level and a lack of emergency action plan preparedness, there is a potential for improvement in risk management measures for this recreational water resource. Enthusiasts of water resources and climate may find interest in monitoring the future developments and enhancements regarding the safety and functionality of Thomason Lake Dam.
Dam Length |
237 |
Dam Height |
28.3 |
River Or Stream |
Lane Creek |
Primary Dam Type |
Earth |
Surface Area |
6.4 |
Hydraulic Height |
24.6 |
Nid Storage |
96 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Noses Creek At Powder Springs Rd
|
9cfs |
Sweetwater Creek Near Austell
|
91cfs |
Etowah River At Ga 61
|
389cfs |
Sweetwater Creek Below Austell
|
90cfs |
Etowah River At Allatoona Dam
|
4270cfs |
Chattahoochee River Near Fairburn
|
1260cfs |
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.
Thomason Lake Dam