Lagoon Reservoir Dam Reservoir Report

Last Updated: December 5, 2025

Lagoon Reservoir Dam, located in Brazoria, Texas, is a private dam primarily used for recreation purposes.


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Summary

Built in 1967, this buttress-type dam has a height of 6 feet and a length of 96 feet, providing a storage capacity of 148 acre-feet. Situated on the TR-VARNER CREEK, this dam serves as a recreational spot for the local community in East Columbia. Despite its modest size, the dam is subject to high risk, with a hazard potential rating of "Not Available" and a risk assessment indicating a high level of risk.

While the dam itself does not have a spillway, it is equipped with one outlet gate for water release. Although there have been no recent inspections since 2010, the dam is reportedly in "Not Rated" condition. It is interesting to note that the original designer of the dam is unknown, adding an air of mystery to this structure. With its location in a picturesque setting and its important role in providing recreational opportunities, Lagoon Reservoir Dam stands as a unique and intriguing feature in the Texas landscape for water resource and climate enthusiasts to explore and study.

Year Completed

1967

Dam Length

96

Dam Height

6

River Or Stream

TR-VARNER CREEK

Primary Dam Type

Other

Hydraulic Height

6

Nid Storage

148

Structural Height

6

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

6
       
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.