J-M Ranch Reservoir Report

Last Updated: December 13, 2025

J-M Ranch is a privately-owned dam located in Oklahoma City, Oklahoma.


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Summary

Built in 1970, this Earth-type dam stands at a height of 22 feet and spans 800 feet in length, with a storage capacity of 300 acre-feet. Situated on a tributary of Chisholm Creek, the dam serves multiple purposes and is regulated by the Oklahoma Water Resources Board.

Despite its low hazard potential, J-M Ranch poses a very high risk due to its location and structural characteristics. The dam features a controlled spillway and a single valve outlet gate. While it has not been rated for its current condition, the last inspection in December 2010 revealed no major issues. The risk assessment for this dam indicates the need for increased monitoring and potential risk management measures to ensure its continued safety and functionality.

Enthusiasts of water resources and climate will find J-M Ranch to be an intriguing site for study and observation. With its unique design and historical significance, this dam offers a fascinating insight into the management and regulation of water resources in the state of Oklahoma. As efforts to address climate change and water scarcity continue to grow, understanding the role of structures like J-M Ranch becomes increasingly important in protecting our environment and ensuring sustainable water management practices.

Year Completed

1970

Dam Length

800

Dam Height

22

River Or Stream

TRIBUTARY OF CHISHOM CREEK

Primary Dam Type

Earth

Surface Area

30.4

Hydraulic Height

22

Nid Storage

300

Structural Height

22

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

22
       
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.
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Area Campgrounds

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