Oknoname 137009 Reservoir Report

Last Updated: December 6, 2025

Oknoname 137009 is a privately owned dam located in Stephens, Oklahoma, specifically at the ST HWY 7 BRIDGE on the ROCK CR river.


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Summary

Built in 1975, this Earth-type dam stands at 27 feet high and has a hydraulic height of 22 feet. With a storage capacity of 89 acre-feet, it serves multiple purposes and is regulated by the Oklahoma Water Resources Board. Despite its low hazard potential, it is categorized as having a very high risk due to its condition assessment not being rated and lacking an emergency action plan.

With a controlled spillway and one valve for outlet gates, Oknoname 137009 has a maximum discharge capacity of 2599 cubic feet per second. The dam has not been modified over the years and has a regular inspection frequency of 5 years, with the last inspection conducted in August 2011. Although it meets state permitting and inspection requirements, it lacks important emergency preparedness measures such as an updated Emergency Action Plan, which could mitigate the high risk associated with its condition assessment and potential hazard level. For water resource and climate enthusiasts, monitoring and addressing the risk factors of Oknoname 137009 is crucial for ensuring the safety and sustainability of the surrounding environment.

Year Completed

1975

Dam Length

625

Dam Height

27

River Or Stream

ROCK CR

Primary Dam Type

Earth

Hydraulic Height

22

Nid Storage

89

Structural Height

27

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

27
       
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.