Thousand Oaks Dam No 11 Reservoir Report

Last Updated: December 5, 2025

Thousand Oaks Dam No 11, located in Brazos, Texas, is a private concrete dam completed in 1987 with a primary purpose of recreation.


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Summary

This dam on the TR-ALUM CREEK river has a height of 22 feet and a length of 900 feet, with a storage capacity of 120 acre-feet and a surface area of 12.5 acres. It features an uncontrolled spillway with a width of 205 feet and two uncontrolled and one valve outlet gates.

The dam, designed by Kling Engineering, is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes state inspections, permitting, and enforcement. Its condition is assessed as fair, with a moderate risk level and a hazard potential that is not available. The last inspection was conducted in 2014, and the dam has a designated inspection frequency of 5 years.

Thousand Oaks Dam No 11 serves as a crucial water resource and recreational asset in the area, providing storage capacity and flood control while offering opportunities for outdoor activities. With its strategic location and design, this dam plays a vital role in water management and climate resilience efforts in Brazos, Texas, ensuring the safety and well-being of the surrounding communities.

Years Modified

2006 - Other

Year Completed

1987

Dam Length

900

Dam Height

22

River Or Stream

TR-ALUM CREEK

Primary Dam Type

Concrete

Surface Area

12.5

Hydraulic Height

22

Drainage Area

0.26

Nid Storage

120

Structural Height

22

Outlet Gates

Uncontrolled - 2, Valve - 1

Hazard Potential

Not Available

Foundations

Rock, Soil

Nid Height

22
       
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.