Mononame 278 Reservoir Report

Last Updated: December 12, 2025

Mononame 278 is a privately owned earth dam located in Avenue City, Missouri, along TR Dillon Creek.


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Summary

Built in 1968 for recreational purposes, this structure stands at a height of 20 feet and has a storage capacity of 54 acre-feet. With a low hazard potential and a condition assessment of "Not Rated," Mononame 278 serves as a key feature for outdoor enthusiasts looking to enjoy the surrounding area.

Managed by the Rock Island District of the US Army Corps of Engineers, Mononame 278 offers a surface area of 5 acres and drains an area of 81 square miles. Despite its unlisted foundation type and lack of spillway width information, this dam provides a tranquil setting for visitors seeking water-based activities or simply looking to connect with nature. Although not currently regulated or inspected by state agencies, Mononame 278 remains a popular spot for locals and tourists alike.

With its historical significance dating back over half a century, Mononame 278 continues to blend seamlessly into the landscape of Andrew County, Missouri. While lacking certain documentation such as emergency action plans or risk assessments, this dam stands as a testament to the importance of water resources for both recreation and environmental conservation. As climate change threatens the availability of such resources, Mononame 278 serves as a reminder of the need for sustainable practices in managing and preserving our waterways.

Year Completed

1968

Dam Height

20

River Or Stream

TR DILLON CREEK

Primary Dam Type

Earth

Surface Area

5

Drainage Area

81

Nid Storage

54

Structural Height

20

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

20
       
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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.