Hilliard Estates Lake Dam Reservoir Report

Last Updated: December 19, 2025

Hilliard Estates Lake Dam is a privately owned earth dam located in Greene County, Missouri, near the city of Fair Grove.


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Summary

Completed in 1977, the dam serves primarily for recreational purposes, creating a surface area of 4 acres and a storage capacity of 58 acre-feet. The dam stands at a height of 27 feet and is classified as having a high hazard potential, although its condition assessment is currently listed as "Not Rated".

While the dam is not regulated by the state of Missouri and has not undergone recent inspections, it remains a significant feature in the area. The dam is situated on the TR-Little Pomme de Terre River and is part of the Little Rock District, with Congressman Billy Long representing the district. Despite its lack of state oversight, the dam plays a crucial role in providing recreational opportunities for the local community and visitors.

As water resource and climate enthusiasts, the unique characteristics of Hilliard Estates Lake Dam, such as its earth construction and buttress core type, make it an intriguing structure to study. With a storage capacity of 58 acre-feet and a surface area of 4 acres, the dam offers both recreational benefits and potential risks due to its high hazard potential. As it continues to stand as a landmark in Greene County, monitoring and assessing the dam's condition and potential risks will be essential in ensuring the safety and enjoyment of those who interact with it.

Year Completed

1977

Dam Height

27

River Or Stream

TR-LITTLE POMME DE TERRE RIV

Primary Dam Type

Earth

Surface Area

4

Drainage Area

50

Nid Storage

58

Structural Height

27

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

27
       
Seasonal Comparison

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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.