Gabriels Overlook Dam Reservoir Report

Last Updated: December 5, 2025

Gabriels Overlook Dam, located in Williamson County, Texas, serves as a crucial structure for water resource management in the region.


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Summary

Completed in 1964, this earth dam stands at a height of 25 feet with a hydraulic height of 23 feet, providing a storage capacity of 105 acre-feet. The dam plays a vital role in managing water flow from a tributary of the San Gabriel River, with a maximum discharge capacity of 1455 cubic feet per second.

Owned privately, Gabriels Overlook Dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections to ensure its structural integrity. The dam's fair condition assessment in April 2021 highlights its operational reliability, although moderate risk is associated with its use. With a spillway width of 90 feet and uncontrolled outlet gates, the dam is equipped to handle water flow during periods of high precipitation, safeguarding the surrounding area from potential flooding.

As a significant component of the water infrastructure in the Galveston District, Gabriels Overlook Dam not only provides essential water storage but also contributes to the overall environmental management of the region. Its role in water resource management and climate resilience underscores the importance of maintaining and monitoring such critical infrastructure to ensure the safety and well-being of the community it serves.

Year Completed

1964

Dam Length

870

Dam Height

25

River Or Stream

TRIBUTARY OF SAN GABRIEL RIVER

Primary Dam Type

Earth

Surface Area

11.4

Hydraulic Height

23

Drainage Area

0.8

Nid Storage

105

Structural Height

25

Outlet Gates

Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

25
       
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.