Sister Grove Creek Ws Scs Site 34 Dam Reservoir Report

Last Updated: December 5, 2025

Sister Grove Creek WS SCS Site 34 Dam, located in Grayson, Texas, was completed in 1966 with a primary purpose of flood risk reduction along the TR-East Prong Sister Grove Creek.


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Summary

Owned by the local government and regulated by the Texas Commission on Environmental Quality (TCEQ), this earth dam stands at a height of 45 feet and has a length of 2300 feet, with a storage capacity of 329 acre-feet. Despite its high hazard potential and being classified as high risk, the dam's condition assessment remains unrated, highlighting the need for regular inspections and risk management measures.

Designed by the USDA NRCS, this dam is a vital structure for water resource management in the area, with a drainage area of 0.67 square miles and a normal storage capacity of 59 acre-feet. With no spillway and only one outlet gate, the dam serves as a crucial component in mitigating flood risks and controlling the flow of water in the region. While the exact purpose and details of associated structures are not specified, it is evident that the dam plays a significant role in protecting the surrounding community from potential inundation and water-related hazards.

As climate change continues to impact water resources and increase the frequency of extreme weather events, the Sister Grove Creek WS SCS Site 34 Dam remains a key infrastructure for flood risk reduction in Grayson, Texas. With its strategic location and design by the Natural Resources Conservation Service, this earth dam serves as a critical barrier against potential floodwaters, emphasizing the importance of ongoing inspections, risk assessments, and management measures to ensure the safety and resilience of the surrounding area in the face of changing climate patterns.

Year Completed

1966

Dam Length

2300

Dam Height

45

River Or Stream

TR-EAST PRONG SISTER GROVE CR

Primary Dam Type

Earth

Surface Area

8

Hydraulic Height

45

Drainage Area

0.67

Nid Storage

329

Structural Height

45

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

45
       
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.