Dam 30 Reservoir Report

Last Updated: December 5, 2025

Dam 30, also known as 41d, is a Federal-owned structure located in Killeen, Texas, within the Coryell River.


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Summary

Built by the NRCS, this earth dam stands at a height of 22 feet and stretches 850 feet in length, primarily serving the purpose of debris control. Managed by the US Army, Dam 30 has a storage capacity of 135 acre-feet, with a normal storage level of 31 acre-feet and a max discharge of 610 cubic feet per second. Despite its low hazard potential, the dam has not undergone a recent condition assessment and lacks certain emergency preparedness measures.

While Dam 30 has not been modified in recent years, it operates under the supervision of the US Army, with federal funding and regulatory oversight. The dam features an uncontrolled spillway with a width of 42 feet and is primarily composed of buttress core types, supported by rock and soil foundations. Although the risk assessment for Dam 30 indicates a moderate level of risk, there are currently no detailed risk management measures in place. Overall, this structure provides vital debris control functions for the surrounding area, contributing to the management of water resources and climate resilience in the region.

Dam Length

850

Dam Height

22

River Or Stream

Coryell

Primary Dam Type

Earth

Surface Area

6

Nid Storage

135

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

22
       
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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.