Griffin Lake Dam Reservoir Report

Last Updated: December 5, 2025

Griffin Lake Dam, located in Gregg County, Texas, stands as a crucial structure for irrigation purposes along the TR-WYNNS BAYOU.


°F

°F

mph

Wind

%

Humidity

Summary

Built in 1953 by designer F. B. Davison, this private-owned Earth dam stretches 600 feet in length and reaches a height of 30 feet. With a storage capacity of 550 acre-feet, the dam plays a vital role in water management and agriculture in the region.

Despite its significant contribution to the local water resource infrastructure, Griffin Lake Dam has been assessed as being in poor condition as of April 2021. The dam's inspection frequency is set at five years, with the last inspection conducted in May 2014. While it poses a moderate risk, the dam's hazard potential is labeled as "Not Available." It is regulated and maintained by the Texas Commission on Environmental Quality (TCEQ) to ensure its structural integrity and functionality.

With an uncontrolled spillway and two outlet gates, Griffin Lake Dam faces challenges in terms of maintenance and risk management. Its location within the Fort Worth District underlines its importance in water resource management efforts in the region. For water resource and climate enthusiasts, Griffin Lake Dam serves as a focal point for understanding the complexities and importance of sustainable water infrastructure in Texas.

Year Completed

1953

Dam Length

600

Dam Height

30

River Or Stream

TR-WYNNS BAYOU

Primary Dam Type

Earth

Surface Area

26

Hydraulic Height

24

Drainage Area

0.88

Nid Storage

550

Structural Height

30

Outlet Gates

Slide (sluice gate) - 1, Uncontrolled - 1

Hazard Potential

Not Available

Foundations

Rock, Soil

Nid Height

30
       
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.