Oknoname 103005 Reservoir Report

Last Updated: December 11, 2025

Oknoname 103005 is a privately owned dam located in Cleveland, Oklahoma, specifically in the city of Sumner.


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Summary

Built in 1960, this earth dam stands at 16 feet tall with a length of 310 feet, creating a reservoir with a storage capacity of 63 acre-feet. The dam's primary purpose is classified as "Other," and it is regulated by the Oklahoma Water Resources Board. The dam is situated on TR-Black Bear Creek in the Tulsa District and is managed by the primary owner, a private entity.

Despite its low hazard potential and a "Not Rated" condition assessment, Oknoname 103005 poses a very high risk, categorized as a level 1 risk. The dam features a controlled spillway, with one valve for outlet gates. The last inspection date was in November 2005, with an inspection frequency of every 5 years. Although the dam meets state regulations in terms of permitting, inspection, and enforcement, there is limited information available on emergency preparedness, risk management measures, and the overall risk assessment summary for this structure.

Water resource and climate enthusiasts interested in Oknoname 103005 will find it to be a significant earth dam in Oklahoma, contributing to water storage and management in the area. With a history dating back to the 1960s, the dam's location on Black Bear Creek adds to its importance in the region's water infrastructure. Despite its low hazard potential, the dam's high risk rating underscores the need for ongoing monitoring and potential risk mitigation measures to ensure the safety and integrity of the structure for the surrounding community and environment.

Year Completed

1960

Dam Length

310

Dam Height

16

River Or Stream

TR-BLACK BEAR CREEK

Primary Dam Type

Earth

Surface Area

7

Hydraulic Height

16

Nid Storage

63

Structural Height

16

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

16
       
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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.