Scs-Upper Washita Creek Site-036 Reservoir Report

Last Updated: December 6, 2025

SCS-Upper Washita Creek Site-036, located in Roger Mills County, Oklahoma, is a state-regulated earth dam designed by the USDA NRCS for flood risk reduction on Trunk Creek.


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Summary

Completed in 1961, this dam stands at a height of 35 feet and has a maximum storage capacity of 781 acre-feet. With a controlled spillway and one valve outlet gate, the dam has a low hazard potential and is currently in a not rated condition.

Although last inspected in 1980, this dam is maintained by the Oklahoma Water Resources Board and undergoes inspections every five years. Despite its low hazard potential, the risk assessment for SCS-Upper Washita Creek Site-036 is identified as very high, indicating the importance of regular monitoring and management measures to ensure the safety and effectiveness of the structure in mitigating flood risks in the area. With its critical role in flood risk reduction in the region, this dam serves as a vital infrastructure for water resource and climate management enthusiasts in the area.

Year Completed

1961

Dam Length

1684

Dam Height

35

River Or Stream

TRUNK CR

Primary Dam Type

Earth

Surface Area

51

Hydraulic Height

31

Nid Storage

781

Structural Height

35

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

35
       
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.