White Lake Dam Reservoir Report

Last Updated: December 5, 2025

White Lake Dam in Bexar, Texas, is a privately owned structure that serves the primary purpose of recreation.


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Summary

Completed in 1970, this earth dam stands at a height of 40.6 feet and has a hydraulic height of 42.3 feet. It spans 725 feet in length and has a storage capacity of 420 acre-feet, with normal storage at 124 acre-feet. The dam is located along the TR-San Geronimo Creek and is under the jurisdiction of the Texas Commission on Environmental Quality (TCEQ).

In 2009, White Lake Dam underwent modifications to enhance its hydraulic and structural aspects. It features an uncontrolled spillway with a width of 95 feet and two uncontrolled outlet gates. Despite its moderate hazard potential and unavailability of a condition rating, the dam has not been inspected since January 2011. While there are no associated structures or inundation maps prepared, the dam's risk assessment is classified as moderate. The Emergency Action Plan (EAP) was last revised in March 2015, indicating some level of preparedness for potential emergencies.

Water resource and climate enthusiasts interested in White Lake Dam may find its recreational purpose and historical completion date intriguing. With ongoing risk management measures in place and regulatory oversight by TCEQ, the dam continues to play a crucial role in water management along the San Geronimo Creek. Future inspections and updates to the Emergency Action Plan will be essential for ensuring the safety and resilience of this important infrastructure.

Years Modified

2009 - Hydraulic, 2009 - Structural

Year Completed

1970

Dam Length

725

Dam Height

40.6

River Or Stream

TR-SAN GERONIMO CREEK

Primary Dam Type

Earth

Surface Area

19.32

Hydraulic Height

42.3

Nid Storage

420

Structural Height

42.3

Outlet Gates

Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

42
       
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.