Or Mitchell Lake 1 Dam Reservoir Report

Last Updated: December 5, 2025

Or Mitchell Lake 1 Dam, located in Bexar, Texas, stands as a testament to the vital role of water resource management in the region.


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Summary

Built in 1967 for irrigation purposes along the Medio Creek, this earth dam reaches a height of 32 feet and spans a length of 2537 feet. Despite its age, the dam continues to serve as a crucial water storage facility, with a maximum storage capacity of 520 acre-feet and a normal storage capacity of 192 acre-feet.

Managed by the local government and regulated by the Texas Commission on Environmental Quality (TCEQ), Or Mitchell Lake 1 Dam has not been rated for its condition assessment, but is classified as having a high risk potential. This underscores the importance of regular inspections and risk management measures to ensure the safety and effectiveness of the dam. While the dam currently lacks a spillway and drainage area, it remains a key component of the region's water infrastructure, providing essential water resources for irrigation purposes.

With its strategic location and historical significance, Or Mitchell Lake 1 Dam serves as a focal point for water resource and climate enthusiasts. As a part of the Galveston District and with no federal agency involvement, the dam symbolizes the local government's commitment to water management and reflects the ongoing need for sustainable practices in the face of changing climate conditions. The dam's role in maintaining water supply and supporting agricultural needs highlights the interconnectedness of water resources, climate resilience, and community sustainability in the region.

Year Completed

1967

Dam Length

2537

Dam Height

32

River Or Stream

MEDIO CREEK

Primary Dam Type

Earth

Surface Area

60

Hydraulic Height

32

Nid Storage

520

Structural Height

32

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

32
       
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.