Dam 18 Reservoir Report

Last Updated: December 5, 2025

Dam 18, also known as 42h, is a federal-owned earth dam located in Copperas Cove, Texas, within the Coryell River watershed.


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Summary

Managed by the US Army, this dam stands at a height of 28 feet and has a length of 1070 feet, providing a storage capacity of 29 acre-feet. With a low hazard potential and moderate risk assessment, Dam 18 is designed with a buttress core and is primarily used for flood control purposes. The dam features an uncontrolled spillway with a width of 32 feet, ensuring the safe release of excess water during times of high flow.

Despite not being regulated by the state, Dam 18 undergoes regular inspections with a frequency of 4 times a year to ensure its structural integrity and safety. The last inspection was conducted in September 2020, with a condition assessment currently marked as "Not Available". While the dam does not have an Emergency Action Plan (EAP) in place, it is equipped with emergency contacts and meets moderate risk management guidelines. With its vital role in flood control and water resource management in the region, Dam 18 continues to play a crucial role in safeguarding the surrounding communities from potential risks and hazards associated with extreme weather events.

Dam Length

1070

Dam Height

28

River Or Stream

Coryell

Primary Dam Type

Earth

Nid Storage

29

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

28
       
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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.