Lake Casa Blanca Dam Reservoir Report

Last Updated: December 5, 2025

Lake Casa Blanca Dam, located in Laredo, Texas, is a vital structure managed by the local government for irrigation purposes along the Chacon Creek.


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Summary

Constructed in 1946 by designer Terrell Bartlett, this earth dam stands at a height of 73 feet with a structural height of 78 feet and a length of 5800 feet. It has a storage capacity of 65,000 acre-feet, providing essential water resources for the region.

The dam also serves recreational purposes, with a surface area of 1650 acres and a maximum discharge of 178,001 cubic feet per second. Its spillway, with a width of 1370 feet, is uncontrolled. Despite being classified with a moderate risk assessment, the dam has not been rated for condition assessment. The emergency action plan for the dam was last revised in 2016, ensuring preparedness for any potential hazards.

With its critical role in irrigation and recreation, Lake Casa Blanca Dam stands as a significant infrastructure in Webb County, Texas. Managed by the local government and regulated by the Texas Commission on Environmental Quality, this dam continues to play a crucial role in water resource management and public safety for the surrounding communities.

Year Completed

1946

Dam Length

5800

Dam Height

73

River Or Stream

CHACON CREEK

Primary Dam Type

Earth

Surface Area

1650

Hydraulic Height

73

Drainage Area

117.6

Nid Storage

65000

Structural Height

78

Outlet Gates

Uncontrolled - 4

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

78
       
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.