Thompson Lake Reservoir Report
Nearby: South Point Mcminnville Water Supply
Last Updated: December 13, 2025
Thompson Lake, located in Williamson County, Tennessee, is a privately owned Earth dam structure built in 1950 with a primary purpose that is not specified.
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Summary
The dam has a hydraulic height of 15 feet and a structural height of 18 feet, creating a storage capacity of 65 acre-feet with a normal storage level of 42 acre-feet. The lake covers a surface area of 7 acres and is fed by the Tribmud Creek, making it an essential water resource in the region.
Despite being privately owned, Thompson Lake has a low hazard potential and a moderate risk assessment rating of 3. The dam is inspected every five years, with the last inspection conducted in October 2016. The spillway type is uncontrolled, and there are no associated locks with the dam structure. While the condition assessment is not rated, the lake is considered to be in a stable state with no major issues reported. Overall, Thompson Lake serves as a vital water source in the area and contributes to the local climate and ecosystem.
Year Completed |
1950 |
Dam Length |
220 |
River Or Stream |
TRIBMUD CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
15 |
Drainage Area |
0.78 |
Nid Storage |
65 |
Structural Height |
18 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Harpeth River At Franklin
|
86cfs |
Harpeth River Below Franklin
|
109cfs |
Duck River Above Milltown
|
627cfs |
Duck River At Columbia
|
785cfs |
Big Rock Cr At Double Bridges
|
3cfs |
Copperas Branch Near Kingfield
|
1cfs |
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.
Thompson Lake