Lochwinnoch Dam Reservoir Report

Last Updated: December 11, 2025

Lochwinnoch Dam, located in Callaway County, Missouri, is a private earth dam completed in 1967 for fire protection, stock, and small fish pond purposes.


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Summary

With a height of 24 feet and a length of 820 feet, the dam sits on Mirrers Creek and has a storage capacity of 128 acre-feet. It serves as a key structure for water resource management in the area, ensuring a reliable water supply for various uses while also providing recreational opportunities.

Despite not being regulated by the state, Lochwinnoch Dam has a significant hazard potential and a moderate risk assessment rating. The dam features an uncontrolled spillway with a width of 75 feet and no outlet gates. While its condition assessment is not rated, regular inspections are conducted every five years to monitor its structural integrity and overall safety. Emergency action plans and risk management measures are in place to address any potential hazards and ensure the safety of surrounding communities.

Managed by a private entity, Lochwinnoch Dam plays a crucial role in water resource management and emergency preparedness in the region. Its strategic location on Mirrers Creek and its storage capacity make it a valuable asset for fire protection and recreational activities, while also highlighting the importance of maintaining and monitoring dam infrastructure to mitigate risks and ensure the safety of its operations.

Year Completed

1967

Dam Length

820

Dam Height

24

River Or Stream

TR-MIRRERS CREEK

Primary Dam Type

Earth

Surface Area

7

Hydraulic Height

24

Drainage Area

225

Nid Storage

128

Structural Height

24

Outlet Gates

None

Hazard Potential

Significant

Foundations

Soil

Nid Height

24
       
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.
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Area Campgrounds