Canyon Lake Dam - Dike A Reservoir Report

Last Updated: December 5, 2025

Canyon Lake Dam - Dike A, located in New Braunfels, Texas, is a federal-owned structure managed by the US Army Corps of Engineers.


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Summary

Completed in 1964, this earth dam stands at a height of 224 feet and stretches 4410 feet in length. Its primary purpose is flood risk reduction, but it also serves other functions such as fish and wildlife pond, recreation, and water supply. The dam's storage capacity, spillway type, and hazard potential are all key factors in assessing its risk management strategies.

Despite reducing flood risk to downstream communities, Canyon Lake Dam - Dike A still presents a high hazard potential, primarily due to the possibility of overtopping during extreme flood events. The risk assessment conducted in May 2020 characterized the risk as moderate, emphasizing the potential consequences of a dike breach leading to downstream flooding. To manage this risk, the US Army Corps of Engineers implements measures such as updating emergency action plans, conducting regular inspections, and collaborating with local emergency managers to enhance evacuation procedures and response capabilities.

Continuous efforts are made to mitigate the risk associated with Canyon Lake Dam - Dike A, including stockpiling materials, maintaining road surfaces for erosion resistance, and closely monitoring the structure's performance. Despite well-practiced emergency action plans and collaboration with local authorities, the potential for dike failure and subsequent flooding remains a concern, highlighting the importance of ongoing risk management and preparedness efforts by the US Army Corps of Engineers.

Year Completed

1964

Dam Length

4410

Dam Height

224

River Or Stream

GUADALUPE RIVER

Primary Dam Type

Earth

Surface Area

8308

Hydraulic Height

219

Drainage Area

1425

Nid Storage

1208350

Structural Height

224

Hazard Potential

High

Nid Height

224
       
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.