Sister Grove Creek Ws Scs Site 30 Dam Reservoir Report

Last Updated: December 5, 2025

Sister Grove Creek WS SCS Site 30 Dam, located in Grayson, Texas, is a crucial element in the flood risk reduction efforts of the area.


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Summary

Built in 1958 by the USDA NRCS, this earth dam stands at a height of 34 feet with a length of 1680 feet, providing a storage capacity of 225 acre-feet. Despite its age, the dam is still state-regulated and regularly inspected by the Texas Commission on Environmental Quality (TCEQ) to ensure its structural integrity.

The primary purpose of Sister Grove Creek WS SCS Site 30 Dam is flood risk reduction, serving to protect the surrounding areas from potential inundation. With a drainage area of 0.41 square miles and a surface area of 5.94 acres, the dam plays a vital role in managing the water flow of the TR-Sister Grove Creek. Although it does not have a spillway, the dam features an outlet gate to control water release when needed. While its hazard potential is not available, the dam is categorized as having a high risk, emphasizing the importance of continued monitoring and maintenance.

Even though the condition assessment of Sister Grove Creek WS SCS Site 30 Dam is not rated, its risk management measures are crucial in ensuring the safety of the community. The dam's risk assessment highlights the potential risks associated with its operation, prompting the need for a comprehensive emergency action plan (EAP) and updated contact information. As a key infrastructure owned by the local government, this dam serves as a reminder of the ongoing efforts to manage water resources and climate impacts in the region.

Year Completed

1958

Dam Length

1680

Dam Height

34

River Or Stream

TR-SISTER GROVE CREEK

Primary Dam Type

Earth

Surface Area

5.94

Hydraulic Height

34

Drainage Area

0.41

Nid Storage

225

Structural Height

34

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

34
       
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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.