Mononame 558 Reservoir Report

Last Updated: December 5, 2025

Mononame 558 is a private recreational dam located in Washington, Missouri, along the TR Little Indian Creek.


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Summary

Built in 1961, this earth dam stands at a height of 26 feet and has a storage capacity of 42 acre-feet. Although its primary purpose is for recreation, Mononame 558 also serves as a low hazard potential structure with a condition assessment of "Not Rated".

With its serene surroundings and peaceful waters, Mononame 558 offers visitors a perfect spot for leisure activities and relaxation. Situated in the Kansas City District and overseen by the US Army Corps of Engineers, this dam provides a safe and enjoyable environment for outdoor enthusiasts. Despite its low hazard potential, Mononame 558 remains an important part of the local water resource infrastructure in Missouri.

As a popular destination for water and climate enthusiasts, Mononame 558 continues to attract visitors with its picturesque views and recreational opportunities. Whether you're looking to fish, hike, or simply unwind by the water, this private dam in Richwoods offers a tranquil escape from the hustle and bustle of everyday life. With its historical significance and natural beauty, Mononame 558 is a must-visit destination for those seeking to connect with nature and enjoy the great outdoors.

Year Completed

1961

Dam Height

26

River Or Stream

TR LITTLE INDIAN CREEK

Primary Dam Type

Earth

Surface Area

3

Drainage Area

44

Nid Storage

42

Structural Height

26

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

26
       
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.