Cobb J Reservoir Report

Last Updated: December 11, 2025

Cobb J is a privately owned dam located in Strong City, Oklahoma, along the Wild Horse Creek.


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Summary

Constructed in 1955, this Earth type dam stands at 20 feet tall and spans 610 feet in length, with a capacity to store up to 60 acre-feet of water. Despite being rated as having a low hazard potential, Cobb J is classified as having a very high risk level due to its condition assessment being not rated.

The dam is under the jurisdiction of the Oklahoma Water Resources Board and is regulated, permitted, inspected, and enforced by state authorities. It is equipped with a Controlled spillway and a single valve outlet gate. While the dam has not been modified in recent years, it undergoes regular inspections every 5 years to ensure its structural integrity. The surrounding area has a surface area of 2 acres and a maximum discharge capacity of 1840 cubic feet per second.

For water resource and climate enthusiasts, Cobb J provides an interesting case study in dam infrastructure management. With its unique design features and risk assessment profile, this dam serves as a focal point for understanding the complexities of maintaining and monitoring water structures in a changing climate. The data on Cobb J underscores the importance of regular inspections and risk management measures to ensure the safety and longevity of vital water resources.

Year Completed

1955

Dam Length

610

Dam Height

20

River Or Stream

WILD HORSE CREEK

Primary Dam Type

Earth

Surface Area

2

Hydraulic Height

20

Nid Storage

60

Structural Height

20

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

20
       
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.