Scs-Turkey Creek Site-11 Reservoir Report

Last Updated: December 6, 2025

SCS-Turkey Creek Site-11, located in Foss, Oklahoma, is a state-regulated earth dam designed by the USDA NRCS with a primary purpose of flood risk reduction.


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Summary

Completed in 1960, this structure stands at a height of 38 feet and has a hydraulic height of 34 feet, providing a storage capacity of 362 acre-feet and a normal storage level of 130 acre-feet. The dam spans a length of 1280 feet and features a controlled spillway with a width of 1 foot.

Despite being classified as having a low hazard potential, the risk assessment for SCS-Turkey Creek Site-11 indicates a very high risk level (1). The dam is equipped with a single valve outlet gate and has not undergone a condition assessment or emergency action plan preparation. The last inspection date recorded for this site dates back to January 1, 1980, with an inspection frequency of every 5 years.

Water resource and climate enthusiasts interested in the management and regulation of dams will find SCS-Turkey Creek Site-11 to be a notable case study due to its design by the USDA NRCS and state jurisdiction under the OWRB. The dam's location on TR-Sand Creek in Washita County, Oklahoma, offers insight into flood risk reduction strategies and highlights the importance of ongoing maintenance and risk management measures for ensuring the safety and integrity of water infrastructure in the region.

Year Completed

1960

Dam Length

1280

Dam Height

38

River Or Stream

TR-SAND CREEK

Primary Dam Type

Earth

Surface Area

19

Hydraulic Height

34

Nid Storage

362

Structural Height

38

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

38
       
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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.