Sister Grove Creek Ws Scs Site 33 Dam Reservoir Report

Last Updated: December 5, 2025

Sister Grove Creek WS SCS Site 33 Dam, located in Grayson County, Texas, is a significant Earth dam built in 1957 by the USDA NRCS for flood risk reduction along the East Prong Sister Grove Creek.


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Summary

With a height of 37 feet and a length of 965 feet, this dam serves a primary purpose of flood risk reduction, storing up to 428 acre-feet of water. Despite not having a spillway, the dam provides essential protection to the surrounding area, with a high hazard potential rating.

Managed by the local government and regulated by the Texas Commission on Environmental Quality (TCEQ), the Sister Grove Creek WS SCS Site 33 Dam remains under state jurisdiction for permitting, inspection, and enforcement. Although the dam's condition assessment is not rated, it is crucial to monitor its structural integrity due to its high risk assessment rating of 2. With no designated emergency action plan (EAP) or updated inundation maps, stakeholders must prioritize risk management measures and ensure that emergency contacts are up to date to address any potential hazards effectively.

For water resource and climate enthusiasts, the Sister Grove Creek WS SCS Site 33 Dam presents an intriguing case study in dam engineering and management. As a key flood risk reduction structure in the area, understanding its design, storage capacity, and risk assessment can provide valuable insights into the challenges and opportunities of managing water resources in a changing climate. With a focus on enhancing safety measures and risk mitigation strategies, stakeholders can work towards ensuring the long-term sustainability and resilience of this essential infrastructure.

Year Completed

1957

Dam Length

965

Dam Height

37

River Or Stream

TR-EAST PRONG SISTER GROVE CR

Primary Dam Type

Earth

Surface Area

15.5

Hydraulic Height

37

Drainage Area

0.95

Nid Storage

428

Structural Height

37

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

37
       
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.