Medio De Llano Tank Dam Reservoir Report

Last Updated: December 5, 2025

Medio De Llano Tank Dam, located in McMullen County, Texas, was completed in 1969 and serves as an essential water resource for the region.


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Summary

This private-owned Earth dam stands at a height of 17 feet, with a storage capacity of 453 acre-feet and a surface area of 33 acres. Despite its age, the dam has not been rated for its condition assessment and carries a high risk potential.

The primary purpose of Medio De Llano Tank Dam is listed as 'Other', indicating its significance for various water resource management activities. It is situated along the Caballo Creek and falls under the jurisdiction of the state permitting and inspection regulations. The dam lacks a spillway and features a single outlet gate, emphasizing the need for regular monitoring and risk management measures to ensure its structural integrity and prevent potential hazards.

The Fort Worth District of the US Army Corps of Engineers oversees the Medio De Llano Tank Dam, although it is not a federal-owned structure. With its vital role in providing water storage for the area, enthusiasts and stakeholders in water resource management and climate change should keep a close eye on this dam's maintenance and risk assessment processes to sustain its functionality and prevent any unforeseen disasters.

Year Completed

1969

Dam Length

980

Dam Height

17

River Or Stream

CABALLO CREEK

Primary Dam Type

Earth

Surface Area

33

Hydraulic Height

17

Nid Storage

453

Structural Height

17

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

17
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.