Cool Valley Lake Dam Reservoir Report

Last Updated: December 10, 2025

Cool Valley Lake Dam, located in Morse Mill, Missouri, is a private dam constructed in 1962 for recreational purposes.


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Summary

The dam, standing at a height of 40 feet and a length of 400 feet, creates a reservoir with a normal storage capacity of 211 acre-feet. The dam is primarily regulated by the Missouri Dam and Reservoir Safety Program, ensuring that it meets state inspection and enforcement standards.

Despite its low hazard potential and satisfactory condition assessment, the Cool Valley Lake Dam poses a moderate risk, prompting regular inspections every five years. With Tyrey Creek as the nearby river or stream, the dam serves as a vital structure for water resource management and provides a surface area of 12 acres for recreational activities. The spillway, with a width of 37 feet, is uncontrolled, allowing for controlled water release during times of excess flow.

This Earth core dam, with a buttress foundation, is a key feature in the Franklin County landscape, offering residents and visitors a scenic and safe recreational area. With its historical significance and essential role in water storage and management, Cool Valley Lake Dam stands as a testament to the importance of maintaining and regulating water resources for both environmental and recreational purposes in the region.

Year Completed

1962

Dam Length

400

Dam Height

40

River Or Stream

TYREY CREEK

Surface Area

12

Drainage Area

1136

Nid Storage

220

Structural Height

40

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

40
       
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.