Mc Neil Dam Reservoir Report

Last Updated: December 5, 2025

Mc Neil Dam, located in Travis County, Texas, was completed in 1960 and stands at a height of 18.3 meters.


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Summary

The dam, primarily owned by the local government, serves a variety of purposes and is classified as an Earth dam with a buttress core type. It has a storage capacity of 309 acre-feet and a maximum discharge of 5129 cubic feet per second. The dam's spillway is uncontrolled and spans 223 meters wide.

The dam underwent structural modifications in 2008 and is subject to regular inspections by the Texas Commission on Environmental Quality (TCEQ). Despite its moderate risk rating, the dam's hazard potential and condition assessment are currently not available. Although no Emergency Action Plan (EAP) has been prepared, the dam has a designated number of uncontrolled outlet gates. With its close proximity to the Galveston District and the absence of any associated locks or lock structures, Mc Neil Dam remains a critical water resource management infrastructure in the region, contributing to the overall hydrological landscape of the area.

Years Modified

2008 - Structural

Year Completed

1960

Dam Length

4600

Dam Height

18.3

River Or Stream

Primary Dam Type

Earth

Hydraulic Height

18.3

Drainage Area

1.45

Nid Storage

309

Structural Height

18.3

Outlet Gates

Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

18
       
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.