East Fork Above Lavon Ws Scs Site 3d Dam Reservoir Report

Last Updated: December 5, 2025

Located in Collin, Texas, the East Fork Above Lavon WS SCS Site 3d Dam is a crucial structure designed by the USDA NRCS to manage flood risk along the Herndon Branch.


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Summary

Completed in 1958, this earth dam stands at a height of 35 feet and stretches for 1340 feet, with a storage capacity of 589 acre-feet. The dam serves various purposes including flood risk reduction, fire protection, and recreation, making it a versatile asset for the local community.

Managed by the TCEQ, the East Fork Above Lavon WS SCS Site 3d Dam is regularly inspected and deemed to be in satisfactory condition as of April 2021. Equipped with slide and uncontrolled outlet gates, the dam has a spillway width of 138 feet to handle maximum discharges of up to 6062 cubic feet per second. Despite its moderate risk rating, the dam has not experienced any notable hazard potential, ensuring the safety of nearby residents and infrastructure.

With a history of modifications in 2005, including unspecified alterations, the East Fork Above Lavon WS SCS Site 3d Dam remains a vital component of the local water resource infrastructure. As a focal point for flood risk reduction and water storage, this dam plays a crucial role in safeguarding the community against potential natural disasters while offering recreational opportunities for residents in the region.

Years Modified

2005 - Other

Year Completed

1958

Dam Length

1340

Dam Height

35

River Or Stream

HERNDON BRANCH

Primary Dam Type

Earth

Surface Area

9.3

Hydraulic Height

35

Drainage Area

0.98

Nid Storage

589

Structural Height

35

Outlet Gates

Slide (sluice gate) - 1, Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

35
       
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.