Conrad Jim Reservoir Report

Last Updated: December 6, 2025

Conrad Jim is a privately owned dam located in Marshall County, Oklahoma, near the city of Lebanon.


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Summary

Built in 1974, the primary purpose of this earth dam is flood risk reduction along the Little Hauani Creek. Standing at a height of 20 feet and with a hydraulic height of 15 feet, Conrad Jim has a storage capacity of 80 acre-feet and a normal storage level of 50 acre-feet.

With a low hazard potential and a very high risk assessment rating, this dam is regulated, permitted, inspected, and enforced by the Oklahoma Water Resources Board (OWRB). The structure features a controlled spillway, one valve outlet gate, and a stone core foundation on soil. Despite being last inspected in 2010, Conrad Jim is considered to be in "not rated" condition, highlighting the need for further assessment and risk management measures to ensure its continued safety and functionality for flood control purposes.

For water resource and climate enthusiasts, Conrad Jim represents a vital piece of infrastructure in Oklahoma's flood risk reduction strategy. Its location, design, and regulatory oversight by the OWRB make it a key asset in protecting surrounding areas from potential flooding events. As discussions around climate change and water resource management continue to evolve, the maintenance and upkeep of structures like Conrad Jim will be essential in safeguarding communities and ecosystems against the impacts of extreme weather events.

Year Completed

1974

Dam Length

300

Dam Height

20

River Or Stream

LITTLE HAUANI CR

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

15

Nid Storage

80

Structural Height

20

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

20
       
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.