Mullendor E.C. Iii Reservoir Report

Last Updated: December 13, 2025

Mullendor E.C.


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Summary

III is a private dam located in Bartlesville, Oklahoma, along the TR-Mission Creek. Built in 1966, this Earth dam stands at a height of 25 feet and spans a length of 200 feet, with a maximum storage capacity of 51 acre feet. The dam is regulated by the Oklahoma Water Resources Board (OWRB) and is subject to state jurisdiction, permitting, inspection, and enforcement.

Despite its low hazard potential, Mullendor E.C. III is classified as having a very high risk assessment level, with a risk rating of 1. Although the dam is not rated for its condition assessment, it is equipped with a controlled spillway and a valve outlet gate. The last inspection was conducted in June 2003, with a scheduled inspection frequency of every 5 years. The dam's Emergency Action Plan (EAP) status, inundation maps, and risk management measures are not currently updated or available.

For water resource and climate enthusiasts, Mullendor E.C. III offers a fascinating case study of a privately owned dam in Oklahoma, highlighting the complexities of dam regulation, safety assessments, and emergency preparedness. With its unique design features and risk profile, this dam serves as a reminder of the importance of monitoring and maintaining infrastructure to ensure the safety of communities and the environment in the face of potential hazards.

Year Completed

1966

Dam Length

200

Dam Height

25

River Or Stream

TR-MISSION CR

Primary Dam Type

Earth

Surface Area

1

Hydraulic Height

25

Nid Storage

51

Structural Height

25

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

25
       
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.