Garrett Lake Dam Reservoir Report
Last Updated: December 18, 2025
Garrett Lake Dam, located in St.
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Summary
Charles, Missouri, is a private earth dam completed in 1970 for the primary purpose of recreation. With a height of 20 feet and a storage capacity of 86 acre-feet, this dam sits on TR McCoy Creek and serves the community of Chain of Rocks. Despite not being regulated by the state, the dam has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment.
Although Garrett Lake Dam has not been inspected recently and lacks certain emergency preparedness measures such as an Emergency Action Plan (EAP) and updated inundation maps, it continues to provide recreational opportunities for the surrounding area. The dam's structure, composed of buttress core types, remains intact and its risk management measures are currently unspecified. With its peaceful surface area of 8 acres and a drainage area of 85 acres, Garrett Lake Dam stands as a serene spot for water resource and climate enthusiasts to enjoy the beauty of nature in Missouri.
Year Completed |
1970 |
Dam Height |
20 |
River Or Stream |
TR MCCOY CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
85 |
Nid Storage |
86 |
Structural Height |
20 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Garrett Lake Dam