Sister Grove Creek Ws Scs Site 32 Dam Reservoir Report

Last Updated: December 5, 2025

Sister Grove Creek WS SCS Site 32 Dam, located in Grayson County, Texas, stands as a testament to effective flood risk reduction measures implemented by the USDA NRCS in 1959.


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Summary

This earth dam with a height of 25 feet and a length of 1292 feet plays a crucial role in controlling the flow of the East Prong Sister Grove Creek during heavy rainfall events. With a storage capacity of 1406 acre-feet and a drainage area of 3.55 square miles, the dam helps mitigate flooding and ensures the safety of the surrounding communities.

The dam features an uncontrolled spillway with a width of 102 feet and two uncontrolled outlet gates. Despite being classified as having a fair condition assessment as of April 2021, the dam poses a moderate risk level due to its age and potential hazards. Regular inspections and maintenance efforts are essential to ensure the continued effectiveness and safety of the dam. As a state-regulated structure under the jurisdiction of TCEQ, the dam is subject to permitting, inspection, and enforcement measures to uphold its functionality and protect the environment.

As water resource and climate enthusiasts marvel at the engineering marvel that is Sister Grove Creek WS SCS Site 32 Dam, they can appreciate its role in safeguarding communities from flooding events. The structured management of the dam, including its emergency action plan and risk assessment, underscores the commitment to public safety and environmental stewardship. With a rich history of flood risk reduction and water management, this dam serves as a vital infrastructure piece in the region's water resource management efforts.

Year Completed

1959

Dam Length

1292

Dam Height

25

River Or Stream

EAST PRONG SISTER GROVE CREEK

Primary Dam Type

Earth

Surface Area

30

Hydraulic Height

25

Drainage Area

3.55

Nid Storage

1406

Structural Height

25

Outlet Gates

Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

25
       
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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.