Willow Tank Dam Reservoir Report
Last Updated: December 12, 2025
Willow Tank Dam, located in Zavala, Texas, is a privately owned earth dam constructed in 1972 for water supply purposes on TR-Turkey Creek.
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Summary
Standing at a height of 8 feet with a length of 1100 feet, the dam has a storage capacity of 67 acre-feet and a surface area of 12 acres. Despite lacking a spillway, the dam serves as a vital resource for the region, providing 24 acre-feet of normal storage.
Although the dam has not been rated for its condition, it is classified as having a high risk potential. With no recent inspection data available since April 1986, there is a need for updated assessments and potential risk management measures to ensure the safety and longevity of the structure. As water resource and climate enthusiasts, it is essential to monitor and maintain infrastructure like Willow Tank Dam to safeguard the surrounding community and environment.
Year Completed |
1972 |
Dam Length |
1100 |
Dam Height |
8 |
River Or Stream |
TR-TURKEY CREEK |
Primary Dam Type |
Earth |
Surface Area |
12 |
Hydraulic Height |
8 |
Nid Storage |
67 |
Structural Height |
8 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nueces Rv Bl Uvalde
|
1cfs |
Leona Rv Nr Uvalde
|
0cfs |
Frio Rv Bl Dry Frio Rv Nr Uvalde
|
0cfs |
Nueces Rv Nr Asherton
|
0cfs |
Nueces Rv At Laguna
|
53cfs |
Sabinal Rv At Sabinal
|
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.
Willow Tank Dam