Seggern Gss Reservoir Report

Last Updated: December 5, 2025

Seggern Gss is a privately owned earth dam located in Williamson County, Texas, along the TR-Mustang Creek.


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Summary

Built in 1981 by the USDA NRCS, this structure stands at 23 feet high and spans 746 feet in length, with a storage capacity of 88 acre-feet. Despite lacking a spillway, the dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections and enforcement measures to ensure its safety and compliance with state regulations.

The primary purpose of Seggern Gss is listed as "Other," with its core type being buttress and foundation type unlisted/unknown. While it currently holds a high risk assessment rating, the dam's condition is not rated, and its hazard potential is deemed not available. With one outlet gate in place and no associated structures, Seggern Gss presents a unique case for water resource and climate enthusiasts to study and monitor, especially given its location within the Galveston District of the US Army Corps of Engineers.

Although Seggern Gss may not have a designated emergency action plan or inundation maps prepared, its presence along the TR-Mustang Creek underscores the importance of maintaining and monitoring dams for water resource management and climate resilience. As a privately owned structure under state jurisdiction, efforts to assess and manage the risks associated with Seggern Gss can serve as a valuable example of how collaboration between regulators, designers, and owners can help ensure the safety and sustainability of critical water infrastructure in Texas.

Year Completed

1981

Dam Length

746

Dam Height

23

River Or Stream

TR-MUSTANG CREEK

Primary Dam Type

Earth

Hydraulic Height

23

Nid Storage

88

Structural Height

23

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

23
       
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.