Rockwall-Forney Dam Reservoir Report

Last Updated: December 5, 2025

Rockwall-Forney Dam, located in Seagoville, Texas, is a key water supply infrastructure owned and regulated by local government authorities.


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Summary

Completed in 1969, this earth dam stands at a height of 68 feet along the East Fork Trinity River, with a maximum storage capacity of 575,040 acre-feet and a normal storage capacity of 452,040 acre-feet. The dam's primary purpose is to provide water supply to the surrounding region, serving as a critical resource for the community.

With a spillway width of 560 feet and a maximum discharge capacity of 375,000 cubic feet per second, Rockwall-Forney Dam is equipped to manage controlled releases during periods of high water flow. The dam has undergone modifications in 1996 to enhance its structural integrity, ensuring its continued effectiveness in water management. However, the hazard potential and condition assessment of the dam are currently not available or rated, highlighting the need for ongoing monitoring and maintenance to address any potential risks.

Despite the lack of recent condition assessments, Rockwall-Forney Dam remains a crucial element of the region's water infrastructure, supporting water supply needs and regulating water flow along the East Fork Trinity River. As climate change continues to impact water resources, the proper management and maintenance of such dams are essential to ensuring the safety and sustainability of water supply systems in the face of evolving environmental challenges.

Years Modified

1996 - Structural

Year Completed

1969

Dam Length

12500

Dam Height

68

River Or Stream

EAST FORK TRINITY RIVER

Primary Dam Type

Earth

Surface Area

22745

Hydraulic Height

57

Drainage Area

1071

Nid Storage

575040

Structural Height

68

Outlet Gates

Other Controlled - 1, Slide (sluice gate) - 3

Hazard Potential

Not Available

Foundations

Soil

Nid Height

68
       
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.