Mauai Dam Reservoir Report

Last Updated: December 5, 2025

Mauai Dam, located in Travis County, Texas, was completed in 1997 with the primary purpose of flood risk reduction along the Kincheon Branch of Williamson Creek.


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Summary

Designed by FREESE & NICHOLS INC and LONGARO & CLARKE INC, this earth dam stands at 12 feet high and stretches 1776 feet in length, with a storage capacity of 43 acre-feet. The dam's spillway, with a width of 35 feet, is uncontrolled and can discharge up to 678 cubic feet per second in times of heavy rainfall.

Despite its age, Mauai Dam remains in satisfactory condition as of the latest assessment in February 2016, with a moderate risk rating. The dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections every 5 years to ensure its structural integrity and functionality. With its strategic location in Austin and critical role in flood risk management, Mauai Dam continues to serve as a vital infrastructure for safeguarding the local community and environment from potential water-related disasters.

Years Modified

2008 - Hydraulic

Year Completed

1997

Dam Length

1776

Dam Height

11

River Or Stream

KINCHEON BR-WILLIAMSON CK

Primary Dam Type

Earth

Hydraulic Height

12

Drainage Area

0.29

Nid Storage

43

Structural Height

12

Outlet Gates

Uncontrolled - 3

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.