Cooper Ranch Reservoir Report

Last Updated: December 15, 2025

Cooper Ranch is a privately owned earth dam located in Osage, Oklahoma, near the city of Kaw City.


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Summary

Built in 1940, this dam on the TR-Haines Creek stands at a height of 30 feet and has a storage capacity of 270 acre-feet. The dam serves multiple purposes and has a controlled spillway with a width of 1 foot. It has a low hazard potential and is currently in a not-rated condition.

This dam is under the jurisdiction of the Oklahoma Water Resources Board (OWRB) and is subject to state regulation, permitting, inspection, and enforcement. The last inspection was conducted in 2011 with a frequency of every 5 years. Despite its low hazard potential, a very high risk assessment rating indicates potential vulnerabilities and the need for effective risk management measures. The dam has one outlet gate and is primarily constructed with stone core and soil foundation.

For water resource and climate enthusiasts, Cooper Ranch represents a unique case study in dam infrastructure in Oklahoma. With its historical significance, varied purposes, and challenging risk assessment, this dam showcases the complexities and importance of managing water resources in a changing climate. The data provides valuable insights into the design, construction, and ongoing maintenance of this critical water storage and control structure.

Year Completed

1940

Dam Length

250

Dam Height

30

River Or Stream

TR-HAINES CR

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

25

Nid Storage

270

Structural Height

30

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

30
       
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.