Thompson Lake Dam Reservoir Report
Last Updated: December 6, 2025
Thompson Lake Dam, located in Bandera, Texas, serves as a vital source of water for the surrounding area and plays a crucial role in supporting fish and wildlife populations.
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Summary
Built in 1964, this earth dam stands at a height of 25 feet and stretches 750 feet in length, with a storage capacity of 263 acre-feet. The dam's primary purpose is for fish and wildlife preservation, while also serving functions such as fire protection, stock pond, and recreational activities.
Despite being privately owned, Thompson Lake Dam falls under the regulation of the state of Texas, with regular inspections conducted to ensure its structural integrity and safety. The dam features an uncontrolled spillway with a width of 60 feet and two uncontrolled outlet gates. In 2004, the dam underwent structural modifications to enhance its performance and longevity. With a moderate risk assessment rating, Thompson Lake Dam continues to play a crucial role in water resource management and conservation efforts along Mickle Creek.
Water resource and climate enthusiasts will find Thompson Lake Dam to be a fascinating site with its unique design and purpose. As a key component in the ecosystem of Bandera, Texas, the dam provides essential water storage for fish and wildlife, while also offering recreational opportunities for the local community. With its long history and ongoing maintenance efforts, Thompson Lake Dam stands as a testament to the importance of sustainable water management practices in the face of changing climate conditions.
Years Modified |
2004 - Structural |
Year Completed |
1964 |
Dam Length |
750 |
Dam Height |
25 |
River Or Stream |
MICKLE CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Hydraulic Height |
25 |
Drainage Area |
1.7 |
Nid Storage |
263 |
Structural Height |
25 |
Outlet Gates |
Uncontrolled - 2 |
Hazard Potential |
Not Available |
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.
Thompson Lake Dam