Scs-Tonkawa Creek Site-008 Reservoir Report

Last Updated: December 6, 2025

SCS-Tonkawa Creek Site-008 in Caddo, Oklahoma, is a state-regulated dam designed by the USDA NRCS with a primary purpose of flood risk reduction.


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Summary

Completed in 1969, this earth dam stands at 27 feet tall and spans 1140 feet in length along the TR-Tonkawa Creek. With a maximum storage capacity of 121 acre-feet and a controlled spillway, this structure plays a crucial role in managing water levels and reducing the risk of flooding in the area.

Located in Anadarko, Oklahoma, this dam is under the jurisdiction of the OWRB and is subject to state permitting, inspection, and enforcement. Despite being rated as having low hazard potential, the dam is considered to have a very high risk due to its proximity to high-risk flood areas. While the condition assessment is currently not rated, the emergency action plan status and risk management measures for this site are not specified. With a single valve outlet gate and a history of periodic inspections, SCS-Tonkawa Creek Site-008 remains a key infrastructure for water resource management in the region.

Overall, SCS-Tonkawa Creek Site-008 serves as a critical flood risk reduction structure in Caddo County, Oklahoma, with a focus on protecting local communities from potential inundation. Managed by the Natural Resources Conservation Service, this earth dam has a long history of operation and stands as a testament to the importance of water resource management in mitigating climate-related risks. As climate change continues to impact the frequency and intensity of extreme weather events, structures like SCS-Tonkawa Creek Site-008 play an essential role in safeguarding the natural environment and local populations from the threats of flooding and water-related disasters.

Year Completed

1969

Dam Length

1140

Dam Height

27

River Or Stream

TR-TONKAWA CR

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

24

Nid Storage

121

Structural Height

27

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

27
       
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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.