Lambshead Tank Dam Reservoir Report

Last Updated: December 5, 2025

Lambshead Tank Dam, located in Throckmorton, Texas, is a privately owned earth dam completed in 1912.


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Summary

The dam, standing at a height of 20 feet, serves the primary purpose of providing water storage for the surrounding area, with a storage capacity of 194 acre-feet. With a surface area of 13 acres and a drainage area of 1.8 square miles, the dam plays a crucial role in managing water resources in the region.

The dam, situated on the TR-Lambshead Creek, features an uncontrolled spillway with a width of 100 feet and two uncontrolled outlet gates. Over the years, the dam has undergone modifications in 1978 for hydraulic purposes and in 1986 for other reasons. Despite being of moderate risk according to assessments, the dam's condition remains unrated as of the last inspection in 2009. With a maximum discharge capacity of 6,691 cubic feet per second, Lambshead Tank Dam continues to play a vital role in water resource management in the area.

As a significant structure in the Fort Worth District, Lambshead Tank Dam stands as a testament to early 20th-century engineering and water management practices. With its rock foundation and buttress core design, the dam has stood the test of time for over a century. Climate and water resource enthusiasts will find value in studying the history and functionality of this important dam in Texas, as it continues to support the local ecosystem and agricultural activities in the region.

Years Modified

1978 - Hydraulic, 1986 - Other

Year Completed

1912

Dam Length

720

Dam Height

20

River Or Stream

TR-LAMBSHEAD CREEK

Primary Dam Type

Earth

Surface Area

13

Hydraulic Height

20

Drainage Area

1.8

Nid Storage

194

Structural Height

20

Outlet Gates

Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Rock

Nid Height

20
       
Seasonal Comparison

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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.