Mcilwaine Farm Lake Dam Reservoir Report

Last Updated: December 14, 2025

Mcilwaine Farm Lake Dam, located in Ray County, Missouri, serves multiple purposes including grade stabilization, fire protection, and providing a small fish pond for the owners.


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Summary

Completed in 1980, this earth dam stands at a height of 25 feet and has a hydraulic height of 24 feet, with a maximum storage capacity of 33 acre-feet. The dam is associated with the TR-ROCKY FORK river/stream and is under the jurisdiction of the Rock Island District of the US Army Corps of Engineers.

Despite being classified as having a low hazard potential, Mcilwaine Farm Lake Dam has a moderate risk assessment rating of 3. It is currently not rated for its condition assessment, and there is no Emergency Action Plan (EAP) in place for the dam. The spillway of the dam is uncontrolled with a width of 42 feet, and there are no outlet gates present. With a drainage area of 96 acres, the dam has a surface area of 1 acre and a normal storage capacity of 18 acre-feet. While the dam is not state regulated, it plays a crucial role in managing water resources and protecting the surrounding environment.

Year Completed

1980

Dam Length

360

Dam Height

25

River Or Stream

TR-ROCKY FORK

Primary Dam Type

Earth

Surface Area

1

Hydraulic Height

24

Drainage Area

96

Nid Storage

33

Structural Height

26

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

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.