Twin Lake Estates East Lake Dam Reservoir Report
Last Updated: December 5, 2025
Twin Lake Estates East Lake Dam in Medina, Texas is a privately-owned structure designed for recreation purposes.
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Summary
Completed in 1964, this earth dam stands 22 feet tall and spans 1300 feet in length, with a storage capacity of 260 acre-feet. The dam is situated on the TR-W Prong Atascosa River and is regulated by the Texas Commission on Environmental Quality (TCEQ).
Despite its age, the dam's condition assessment was reported as poor in November 2017, with a moderate risk level assigned. The dam features an uncontrolled spillway and one outlet gate. While the hazard potential is not available, the structure is subject to regular inspections every two years to ensure its safety and integrity. The dam's emergency action plan and risk management measures are currently not available, indicating potential areas for improvement in emergency preparedness.
For water resource and climate enthusiasts, Twin Lake Estates East Lake Dam presents a unique case study in private dam ownership and regulation. With its historical significance and recreational purpose, the dam serves as a valuable asset for the community. However, the reported poor condition and moderate risk level highlight the importance of ongoing maintenance and monitoring to safeguard against potential hazards and ensure the dam's long-term viability.
Year Completed |
1964 |
Dam Length |
1300 |
Dam Height |
22 |
River Or Stream |
TR-W PRONG ATASCOSA RIVER |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
22 |
Nid Storage |
260 |
Structural Height |
22 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
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.
Twin Lake Estates East Lake Dam