Sister Grove Creek Ws Scs Site 8 Dam Reservoir Report

Last Updated: December 5, 2025

Sister Grove Creek WS SCS Site 8 Dam, located in Collin County, Texas, is a crucial structure with a primary purpose of flood risk reduction.


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Summary

Built in 1959 by the USDA NRCS, this earth dam stands at 42 feet in height and spans a length of 2075 feet. With a storage capacity of 837 acre-feet and a normal storage of 134 acre-feet, it plays a vital role in managing water resources in the area.

Despite its age, the dam is state-regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections to ensure its structural integrity. The risk assessment for the dam is rated as high, signifying the importance of proper maintenance and monitoring. While the dam currently does not have a spillway, it serves multiple purposes including fire protection, stock or small fish pond, and recreation, in addition to flood risk reduction.

For water resource and climate enthusiasts, the Sister Grove Creek WS SCS Site 8 Dam presents an intriguing case study in dam infrastructure and water management. With its historical significance, regulatory oversight, and high-risk classification, this dam serves as a reminder of the critical role such structures play in safeguarding communities from the impacts of flooding and the importance of sustainable water resource management practices.

Year Completed

1959

Dam Length

2075

Dam Height

42

River Or Stream

TR-SISTER GROVE CREEK

Primary Dam Type

Earth

Surface Area

18.3

Hydraulic Height

42

Drainage Area

1.66

Nid Storage

837

Structural Height

42

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

42
       
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.