Moty Lake Dam Reservoir Report

Last Updated: December 5, 2025

Moty Lake Dam, located in Fanning, Missouri, is a private earth dam primarily used for recreation purposes.


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Summary

Completed in 1960, this dam stands at a height of 29 feet and has a storage capacity of 171 acre-feet. The dam is situated on the TR-Dry Fork River in Phelps County and covers an area of 11 acres.

Despite being categorized as having a low hazard potential, Moty Lake Dam has not been rated for its condition assessment. It is not regulated by the state and does not require regular inspections. The dam does not have an Emergency Action Plan in place, and there is no information available on the risk management measures for this structure.

For water resource and climate enthusiasts, Moty Lake Dam presents an interesting case study of a privately-owned recreational dam with limited regulatory oversight. Its location on the TR-Dry Fork River offers opportunities for outdoor activities and wildlife habitat, while also raising questions about the potential impact of a dam failure in this area. Further research and monitoring of this dam could provide valuable insights into the management of small dams and their role in local ecosystems.

Year Completed

1960

Dam Height

29

River Or Stream

TR-DRY FORK RIVER

Primary Dam Type

Earth

Surface Area

11

Drainage Area

460

Nid Storage

171

Structural Height

29

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

29
       
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.