Twin Tank Dam Reservoir Report
Nearby: Indio Dam Cow Hill Tank Dam
Last Updated: December 15, 2025
Twin Tank Dam, located in Zavala, Texas, is a private-owned Earth dam completed in 1971 with a primary purpose of serving as a Fish and Wildlife Pond.
°F
°F
mph
Wind
%
Humidity
Summary
With a height of 15 feet and a length of 2000 feet, this dam has a storage capacity of 238 acre-feet, making it a vital resource for fire protection, stock watering, and supporting aquatic life in the area. While it lacks a spillway, it is equipped with one outlet gate for water management.
Despite not being regulated by the state, Twin Tank Dam poses a high risk potential due to its condition being not rated and the absence of an Emergency Action Plan. This dam is crucial for maintaining the ecological balance of the TR-GALINA SLOUGH river or stream and providing a habitat for various species of fish and wildlife. With its strategic location and function, Twin Tank Dam plays a significant role in the local ecosystem and water resource management efforts in Texas.
As water resource and climate enthusiasts, it is essential to recognize the importance of Twin Tank Dam in preserving the natural environment and supporting biodiversity in the region. The risk associated with its condition underscores the need for proactive monitoring and management to ensure its continued effectiveness in serving its primary purpose as a Fish and Wildlife Pond. Understanding the role of structures like Twin Tank Dam is crucial for sustainable water resource management and conservation efforts in the face of changing climate patterns.
Year Completed |
1971 |
Dam Length |
2000 |
Dam Height |
15 |
River Or Stream |
TR-GALINA SLOUGH |
Primary Dam Type |
Earth |
Surface Area |
25 |
Hydraulic Height |
15 |
Nid Storage |
238 |
Structural Height |
15 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Leona Rv Nr Uvalde
|
0cfs |
Nueces Rv Bl Uvalde
|
1cfs |
Frio Rv Bl Dry Frio Rv Nr Uvalde
|
0cfs |
Nueces Rv Nr Asherton
|
0cfs |
Sabinal Rv At Sabinal
|
0cfs |
Frio Rv Nr Derby
|
0cfs |
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.
Twin Tank Dam