East Fork Above Lavon Ws Scs Site 31 Dam Reservoir Report

Last Updated: December 5, 2025

Located in McKinney, Texas, the East Fork Above Lavon WS SCS Site 31 Dam is a vital flood risk reduction structure designed by the USDA NRCS in 1965.


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Summary

Standing at a height of 37 feet and stretching 1165 feet in length, this earth dam plays a crucial role in managing floodwaters from the East Fork Trinity River. With a storage capacity of 515 acre-feet and a normal storage level of 96 acre-feet, the dam covers a drainage area of 0.97 square miles, providing protection to the surrounding community.

The dam features an uncontrolled spillway with a width of 83 feet and outlet gates that include a slide and two uncontrolled gates. Despite being in fair condition as of the last assessment in December 2017, the dam is inspected every five years to ensure its continued effectiveness in flood risk reduction. Managed by the local government and regulated by the Texas Commission on Environmental Quality (TCEQ), the East Fork Above Lavon WS SCS Site 31 Dam serves as a critical infrastructure piece in protecting the residents of Collin County from potential flooding events.

With a moderate risk assessment rating of 3, the dam is well-maintained and monitored to prevent any hazards or potential issues. While the hazard potential is not available, the structure meets regulatory guidelines and is equipped to handle emergency situations. As a key component of the Fort Worth District's water management system, this dam showcases the importance of sustainable water resource management and climate adaptation strategies in safeguarding communities from the impacts of extreme weather events.

Year Completed

1965

Dam Length

1165

Dam Height

37

River Or Stream

TR-EAST FORK TRINITY RIVER

Primary Dam Type

Earth

Surface Area

13

Hydraulic Height

37

Drainage Area

0.97

Nid Storage

515

Structural Height

37

Outlet Gates

Slide (sluice gate) - 1, Uncontrolled - 2

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.