Upper Brushy Creek Ws Scs Site 12 Dam Reservoir Report

Last Updated: December 5, 2025

The Upper Brushy Creek WS SCS Site 12 Dam, located in Round Rock, Texas, is a critical flood risk reduction structure designed by the USDA NRCS and completed in 1967.


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Summary

This earth dam stands at a height of 32 feet and spans a length of 5000 feet, with a storage capacity of 2984 acre-feet and a drainage area of 3.57 square miles. The dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction along the Onion Branch river.

Managed by the Texas Commission on Environmental Quality (TCEQ), the dam has undergone inspections with a satisfactory condition assessment as of June 2017. The dam features an uncontrolled spillway with a width of 302 feet and outlet gates including a slide gate and two uncontrolled gates. Despite a moderate risk assessment level, the dam has not been assigned a hazard potential.

With its strategic location and effective design, the Upper Brushy Creek WS SCS Site 12 Dam plays a crucial role in protecting the surrounding community from potential flooding events. Water resource and climate enthusiasts will appreciate the engineering ingenuity and regulatory oversight that have gone into ensuring the safety and functionality of this essential infrastructure.

Years Modified

2005 - Other, 2008 - Hydraulic

Year Completed

1967

Dam Length

5000

Dam Height

32

River Or Stream

ONION BRANCH

Primary Dam Type

Earth

Surface Area

25

Hydraulic Height

32

Drainage Area

3.57

Nid Storage

2984

Structural Height

32

Outlet Gates

Slide (sluice gate) - 1, Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Rock, Soil

Nid Height

32
       
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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.