Horseshoe Bay West Dam C Reservoir Report

Last Updated: December 5, 2025

Horseshoe Bay West Dam C, located in Llano, Texas, was completed in 1980 for the primary purpose of irrigation and recreation.


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Summary

Managed by a private owner, this earth dam stands at 13.5 feet high and spans 154 feet in length, with a maximum storage capacity of 31 acre-feet. The dam, designed by Willis Environmental Engineering Inc, regulates the flow of the TR-DEER HOLLOW stream and is subject to state regulatory oversight by the Texas Commission on Environmental Quality.

With a satisfactory condition assessment as of April 2021, Horseshoe Bay West Dam C poses a moderate risk level and has undergone a structural modification in 1997. The dam features an uncontrolled spillway with a width of 40 feet and is equipped with one uncontrolled and one valve outlet gate. Despite its age, the dam has been regularly inspected and meets state permitting and enforcement requirements. The nearby community benefits from the dam's water storage and recreational opportunities, making it an important resource in the region for both water management and leisure activities.

Years Modified

1997 - Structural

Year Completed

1980

Dam Length

154

Dam Height

13.5

River Or Stream

TR-DEER HOLLOW

Primary Dam Type

Earth

Hydraulic Height

13.5

Drainage Area

0.18

Nid Storage

31

Structural Height

13.5

Outlet Gates

Uncontrolled - 1, Valve - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

14
       
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.