Bar X Development Dam Reservoir Report

Last Updated: December 5, 2025

Bar X Development Dam, also known as Flag Lake, is a private-owned structure located in Brazoria County, Texas.


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Summary

Built in 1953 by the USDA NRCS, this earth dam stands at 8 feet high and spans a length of 11,068 feet. The primary purpose of the dam is for irrigation, with a storage capacity of 530 acre-feet and a normal storage level of 380 acre-feet.

Situated on Tr- Mill Bayou in Lake Jackson, this dam is classified as having a low hazard potential and a moderate risk assessment rating. Despite its age, the condition assessment is currently not available. The dam features an uncontrolled spillway and outlet gates, with no associated structures. Managed by the Natural Resources Conservation Service, Bar X Development Dam plays a crucial role in water resource management in the area, providing essential irrigation for agricultural purposes.

For water resource and climate enthusiasts, Bar X Development Dam is an interesting structure to study due to its historical significance and impact on the local ecosystem. As a vital irrigation source in Texas, the dam serves as a reminder of the intricate balance between human development and environmental conservation. With its low hazard potential and moderate risk assessment, ongoing monitoring and maintenance are essential to ensure the safety and sustainability of this important water resource infrastructure.

Year Completed

1953

Dam Length

11068

Dam Height

8

River Or Stream

Tr- Mill Bayou

Primary Dam Type

Earth

Surface Area

38

Hydraulic Height

8

Nid Storage

530

Structural Height

9

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

9
       
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.