Harden No 1 Reservoir Report

Last Updated: December 5, 2025

Harden No 1 is a privately owned earth dam located in Le Flore, Oklahoma, specifically in the city of Rock Island.


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Summary

Completed in 1975, this dam serves the primary purpose of flood risk reduction along the TR-JAMES FORK CREEK. With a height of 42 feet and a storage capacity of 554 acre-feet, Harden No 1 plays a crucial role in managing water resources in the area.

Managed by the OWRB and regulated by the state of Oklahoma, Harden No 1 has a low hazard potential and has not been assessed for condition. The dam features a controlled spillway and a single valve outlet gate. It is inspected every 5 years, with the last inspection taking place in December 2010. Despite its age, Harden No 1 continues to effectively mitigate flood risks and protect the surrounding communities from potential water-related disasters.

The risk assessment for Harden No 1 classifies it as having a very high risk level of 1, indicating the importance of proper maintenance and monitoring. While the dam has not been modified in recent years, it remains a critical piece of infrastructure in managing water resources and climate challenges in the region. As water resource and climate enthusiasts, it is essential to recognize the vital role that structures like Harden No 1 play in safeguarding communities and ecosystems from the impacts of extreme weather events.

Year Completed

1975

Dam Length

575

Dam Height

42

River Or Stream

TR-JAMES FORK CREEK

Primary Dam Type

Earth

Hydraulic Height

40

Nid Storage

554

Structural Height

42

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

42
       
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.