Thomas Lake Dam Reservoir Report
Nearby: Davis Lake Dam Gillespie Lake Dam
Last Updated: January 12, 2026
Thomas Lake Dam, located in Gentry, Missouri, along the TR-Middle Fork Grand River, serves primarily as a debris control structure.
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Summary
Built in 1974, this private dam stands at a height of 25 feet and has a storage capacity of 40 acre-feet. With a low hazard potential and a condition assessment of "Not Rated," the dam plays a crucial role in fire protection, stock, and small fish pond management in the area.
Despite being privately owned and not regulated by the state, Thomas Lake Dam remains a key feature in managing water resources in the region. Its earth dam type with buttress core design ensures stability and effectiveness in its primary purpose. With a normal storage capacity of 22 acre-feet and a drainage area of 85 square miles, the dam contributes to the overall water management strategy in the area, enhancing flood control and ensuring a stable water supply for various purposes.
While lacking specific details on inspection frequency and emergency preparedness, Thomas Lake Dam's presence underscores the importance of maintaining infrastructure for water resource management and climate resilience. As a part of the Rock Island District and with a designated emergency action plan, the dam serves as a vital component in the broader network of structures that help mitigate natural disasters and ensure the sustainable use of water resources in the region.
Year Completed |
1974 |
Dam Height |
25 |
River Or Stream |
TR-MIDDLE FORK GRAND RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
85 |
Nid Storage |
40 |
Structural Height |
25 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Thomas Lake Dam