Sister Grove Creek Ws Scs Site 5 Dam Reservoir Report

Last Updated: December 5, 2025

Sister Grove Creek WS SCS Site 5 Dam, located in Collin County, Texas, is a vital structure designed by the USDA NRCS for flood risk reduction along the Sweetwater Creek.


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Summary

Completed in 1952, this earth dam stands at a height of 49 feet and has a length of 1220 feet, providing a maximum storage capacity of 900 acre-feet. The dam serves multiple purposes including fire protection, stock or small fish pond, flood risk reduction, and recreation for the local community.

With a fair condition assessment as of June 2018, the dam is inspected every 5 years to ensure its structural integrity and safety. The spillway, with a width of 176 feet, is uncontrolled and can handle a maximum discharge of 5097 cubic feet per second. While the hazard potential and risk assessment are currently not available, the dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and meets state permitting, inspection, and enforcement requirements. The primary purpose of the dam is to mitigate flood risks and protect the surrounding area from potential inundation.

As water resource and climate enthusiasts, the Sister Grove Creek WS SCS Site 5 Dam presents an intriguing case study in dam engineering and management. With its unique design features and history of serving the local community for nearly 70 years, this dam showcases the importance of proactive maintenance and inspection protocols to ensure public safety and environmental protection. The collaboration between local and federal agencies, including the NRCS and TCEQ, highlights the ongoing commitment to managing water resources effectively in the face of changing climate conditions and increasing development pressures in Collin County, Texas.

Year Completed

1952

Dam Length

1220

Dam Height

49

River Or Stream

SWEETWATER CREEK

Primary Dam Type

Earth

Surface Area

11

Hydraulic Height

49

Drainage Area

1.91

Nid Storage

900

Structural Height

49

Outlet Gates

Slide (sluice gate) - 1, Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

49
       
Seasonal Comparison

Weather Forecast

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.