Scs-Cotton-Coon-Mission Cr Site-013 Reservoir Report

Last Updated: December 10, 2025

SCS-Cotton-Coon-Mission Cr Site-013, located in Washington County, Oklahoma, is a state-regulated earth dam constructed in 1955 by the NRCS with a primary purpose of flood risk reduction along the TR-Coon Creek.


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Summary

This dam stands at a height of 38 feet and has a hydraulic height of 35 feet, with a length of 3150 feet and a storage capacity of 1050 acre-feet. Despite being rated as having low hazard potential, it is considered to have a very high risk due to its location and the potential impact of failure.

The dam features a controlled spillway and a single valve outlet gate for water release. It has not been inspected since 1980, with an inspection frequency of every 5 years. Although it is currently in a not-rated condition, the risk assessment for this dam is categorized as very high, indicating the need for proper risk management measures to mitigate any potential dangers. With the dam being located in a region prone to extreme weather events, such as floods and storms, it is crucial to ensure its structural integrity and maintenance to safeguard the surrounding communities and water resources.

Year Completed

1955

Dam Length

3150

Dam Height

38

River Or Stream

TR-COON CREEK

Primary Dam Type

Earth

Surface Area

15

Hydraulic Height

35

Nid Storage

1050

Structural Height

38

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

38
       
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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.