Mitchell Lake Dam Reservoir Report

Last Updated: December 5, 2025

Mitchell Lake Dam, located in Bexar, Texas, serves as a crucial water resource for irrigation purposes along the TR-Medina River.


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Summary

Completed in 1967, this earth dam stands at a height of 10 feet and has a length of 3500 feet, providing a storage capacity of 5000 acre-feet. The dam boasts a controlled spillway with a width of 200 feet, ensuring efficient water management during times of excess flow.

Despite its age, Mitchell Lake Dam remains in good structural condition, with the last inspection conducted in 2008. The dam has undergone modifications in 1992 to enhance its structural integrity, and it is regulated by the Texas Commission on Environmental Quality (TCEQ). With a very high risk assessment rating, the dam is closely monitored to mitigate any potential hazards and ensure the safety of surrounding communities.

Managed by the local government, Mitchell Lake Dam stands as a testament to efficient water resource management in Texas. As climate change continues to impact water availability and quality, dams like Mitchell Lake play a vital role in securing irrigation water for agricultural purposes. With its strategic location and reliable infrastructure, Mitchell Lake Dam remains a key asset in the state's efforts to sustainably manage its water resources in the face of a changing climate.

Years Modified

1992 - Structural

Year Completed

1967

Dam Length

3500

Dam Height

10

River Or Stream

TR-MEDINA RIVER

Primary Dam Type

Earth

Surface Area

750

Hydraulic Height

10

Drainage Area

10

Nid Storage

5000

Structural Height

10

Outlet Gates

Other Controlled - 3, Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

10
       
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.