Oknoname 119003 Reservoir Report

Last Updated: December 6, 2025

Oknoname 119003, located in Payne County, Oklahoma, is a privately owned earth dam constructed in 1960 for flood risk reduction along the TR-Little Stillwater Creek.


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Summary

Standing at a height of 30 feet and spanning 400 feet in length, this dam has a maximum storage capacity of 80 acre-feet and normal storage of 40 acre-feet. With a controlled spillway and a low hazard potential, this structure has been regulated and inspected by the Oklahoma Water Resources Board to ensure its integrity.

Despite not being rated in terms of condition assessment, Oknoname 119003 poses a very high risk according to the data, making it crucial for emergency preparedness and risk management measures to be in place. The dam features one valve outlet gate and has undergone inspection every 5 years, with the last inspection dating back to December 2003. With a risk assessment of level 1 (very high), it is evident that this structure plays a significant role in mitigating flood risks in the region.

Owned by a private entity and situated in the city of Morrison, this dam serves as a vital infrastructure for flood control in the area. With its stone core and soil foundation, Oknoname 119003 stands as a testament to the importance of water resource management and climate resilience efforts. Its location along the TR-Little Stillwater Creek underscores the role of such structures in safeguarding communities from potential water-related disasters.

Year Completed

1960

Dam Length

400

Dam Height

30

River Or Stream

TR-LITTLE STILLWATER CR

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

30

Nid Storage

80

Structural Height

30

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

30
       
Seasonal Comparison

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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.