Clark Dam Reservoir Report

Last Updated: December 5, 2025

Clark Dam, located in Johnson, Texas, is a privately owned structure built in 1954 by USDA NRCS for the primary purpose of irrigation along Mustang Creek.


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Summary

Standing at a height of 22 feet with a length of 854 feet, this earth dam with a buttress core is designed to hold 294 acre-feet of water. Despite being unregulated by the state, the dam is equipped with one outlet gate and does not have a spillway.

With a high hazard potential rating of 2, Clark Dam poses a significant risk in the event of a failure, although its condition assessment is currently not rated. While it does not have an Emergency Action Plan in place, the dam is inspected regularly, with enforcement and management measures for risk mitigation yet to be detailed. Situated in the Fort Worth District, the dam plays a crucial role in supporting agricultural activities in the region, highlighting the importance of maintaining its structural integrity and ensuring proper risk management protocols.

Year Completed

1954

Dam Length

854

Dam Height

22

River Or Stream

TR-MUSTANG CREEK

Primary Dam Type

Earth

Hydraulic Height

22

Nid Storage

294

Structural Height

22

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

22
       
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.