Dilthey Lake Dam Reservoir Report

Last Updated: December 20, 2025

Located in Pettis, Missouri, the Dilthey Lake Dam is a private-owned structure with a primary purpose of recreation.


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Summary

Completed in 1960, this earth dam with a structural height of 30 feet provides a maximum storage capacity of 32 acre-feet and a normal storage of 19 acre-feet. The dam sits on the TR-Lamine River and covers a surface area of 2 acres with a drainage area of 10 acres, making it an essential resource for water activities and wildlife habitat in the region.

Despite its low hazard potential, the Dilthey Lake Dam has not been rated for condition assessment. With no state regulation, permitting, or inspection required, the dam serves as an important recreational spot without significant oversight. The dam's lack of associated structures and federal agency involvement make it a unique and self-sustaining resource for outdoor enthusiasts and climate advocates to enjoy.

For those interested in water resource management and climate conservation, the Dilthey Lake Dam presents an intriguing case study of a privately-owned earth dam with a focus on recreation. Its tranquil location on the TR-Lamine River in Pettis, Missouri, offers a haven for water activities and wildlife, while also raising questions about the lack of regulatory oversight and maintenance assessments. As enthusiasts explore the dam's history and significance, they can appreciate its role in providing a peaceful retreat and natural habitat in the heart of Missouri.

Year Completed

1960

Dam Height

30

River Or Stream

TR-LAMINE RIVER

Primary Dam Type

Earth

Surface Area

2

Drainage Area

10

Nid Storage

32

Structural Height

30

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

30
       
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.