Lake Bryson Dam Reservoir Report

Last Updated: December 5, 2025

Lake Bryson Dam, located in Jack, Texas, is a vital structure designed by BIGGS AND MATHEWS INC in 1980 for water supply purposes.


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Summary

This earth-type dam, with a height of 30 feet and a length of 995 feet, regulates the flow of East Rock Creek and provides a maximum storage capacity of 1750 acre-feet. Despite its fair condition assessment, the dam is regulated, permitted, inspected, and enforced by the Texas Commission on Environmental Quality (TCEQ) to ensure its safety and functionality.

With a spillway width of 215 feet and uncontrolled spillway type, Lake Bryson Dam has a moderate risk assessment level of 3. Although it has not been modified since 2005, the dam's emergency action plan (EAP) status and risk management measures are not publicly available. The dam's hazard potential is not specified, and the last inspection took place in 2008, with a recent condition assessment conducted in April 2021. Lake Bryson Dam serves as a crucial water resource for the community and highlights the importance of proper maintenance and regulatory oversight in ensuring its long-term sustainability and safety.

Years Modified

2005 - Other

Year Completed

1980

Dam Length

995

Dam Height

30

River Or Stream

EAST ROCK CREEK

Primary Dam Type

Earth

Hydraulic Height

30

Drainage Area

4.83

Nid Storage

1750

Structural Height

34

Outlet Gates

Uncontrolled - 3

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

34
       
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.