Lake Oz Dam Reservoir Report

Last Updated: December 5, 2025

Lake Oz Dam, located in Boerne, Texas, serves as a crucial structure for irrigation purposes along Frederick Creek.


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Summary

Completed in 1964, this gravity-type dam stands at a height of 12 feet and has a length of 500 feet, with a storage capacity of 50 acre-feet. Despite being privately owned, the dam is subject to state permitting and inspection requirements, ensuring its safety and functionality for the surrounding area.

While the dam lacks a spillway and has not been inspected since 1978, its hazard potential is currently listed as "Not Available." However, with a risk assessment rating of "High (2)," it is evident that there are potential concerns that need to be addressed. The dam's condition assessment is marked as "Not Rated," indicating a need for further evaluation and maintenance to mitigate any potential risks associated with its operation.

With its location in Kendall County, Texas, Lake Oz Dam stands as a vital component of the local water resource infrastructure. As water resource and climate enthusiasts, it is essential to monitor and advocate for the safety and regulation of dams like Lake Oz to ensure the sustainable management of water for irrigation and environmental purposes.

Year Completed

1964

Dam Length

500

Dam Height

12

River Or Stream

FREDERICK CREEK

Primary Dam Type

Gravity

Hydraulic Height

12

Nid Storage

50

Structural Height

12

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

12
       
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.