One At Lake Dam Reservoir Report

Last Updated: December 5, 2025

One At Lake Dam, located in Liberty County, Texas, is a privately owned earth dam completed in 1955 primarily for recreation purposes.


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Summary

With a height of 16 feet and a length of 1010 feet, the dam provides a storage capacity of 150 acre-feet, with a normal storage level of 57 acre-feet. Situated on the Trinity River, the dam does not have a spillway and is rated as having a high risk potential.

Despite being privately owned, the dam is regulated by the state of Texas and undergoes regular inspections. The last recorded inspection was in 1979, with the condition of the dam currently listed as not rated. While it lacks certain safety features like a spillway, One At Lake Dam remains a popular spot for recreational activities in the area. However, the high risk potential associated with the dam underscores the importance of ongoing monitoring and maintenance to ensure the safety of the surrounding community and environment.

Year Completed

1955

Dam Length

1010

Dam Height

16

River Or Stream

TR-TRINITY RIVER

Primary Dam Type

Earth

Surface Area

43

Hydraulic Height

16

Nid Storage

150

Structural Height

16

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

16
       
Seasonal Comparison

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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.