Mawis Lake Dam Reservoir Report

Last Updated: December 5, 2025

Mawis Lake Dam, located in Austin, Texas, was completed in 1960 and serves multiple purposes including fire protection and as a stock or small fish pond.


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Summary

This private dam, with a height of 11 feet and a length of 405 feet, holds a storage capacity of 52 acre-feet. It is primarily an earth dam with a buttress core type, situated on the Long Branch-Piney Creek.

Despite being privately owned, Mawis Lake Dam is subject to state permitting and inspection, ensuring its safety and compliance with regulations. The dam does not have a spillway and is not rated for its condition assessment. However, the risk assessment indicates a high risk level (2), emphasizing the importance of proper maintenance and management measures to mitigate potential hazards.

As a key component of the water resource infrastructure in the area, Mawis Lake Dam plays a crucial role in supporting various activities and maintaining water supply for fire protection. Enthusiasts interested in water resources and climate will find this dam's design and functionality intriguing, as it highlights the intersection of human engineering with natural water systems.

Year Completed

1960

Dam Length

405

Dam Height

11

River Or Stream

LONG BRANCH-PINEY CREEK

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

11

Nid Storage

52

Structural Height

11

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

11
       
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.