Lake Joy Dam Reservoir Report
Last Updated: December 5, 2025
Located in Dent, Missouri, the Lake Joy Dam is a privately owned structure that serves multiple purposes including flood control and recreation.
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Summary
Built in 1985, this earth dam stands at a height of 40 feet and has a length of 600 feet, creating a reservoir with a storage capacity of 936 acre-feet. The dam is regulated by the Dam and Reservoir Safety Program in Missouri and undergoes regular inspections to ensure its structural integrity.
With a drainage area of 325 square miles, Lake Joy Dam plays a crucial role in managing water flow from the tributaries of Hutchins Creek to the Marmack River. The dam's spillway, although uncontrolled, has a width of 48 feet to handle maximum discharge flows of up to 608 cubic feet per second. The overall condition of the dam is assessed as satisfactory, with a significant hazard potential but moderate risk level. Emergency action plans are in place to mitigate any potential risks, and the dam's operations are closely monitored to uphold safety standards.
As a key component of water resource management in the region, Lake Joy Dam serves as a testament to the importance of infrastructure in safeguarding communities against flood risks and ensuring sustainable water supply. Its presence not only offers recreational opportunities but also contributes to the overall resilience of the area in the face of changing climate patterns. With continued monitoring and maintenance, Lake Joy Dam remains a vital asset in preserving the environmental and societal well-being of Dent, Missouri.
Year Completed |
1985 |
Dam Length |
600 |
Dam Height |
40 |
River Or Stream |
TRIB HUTCHINS CK TO MARMAC |
Surface Area |
30 |
Drainage Area |
325 |
Nid Storage |
936 |
Structural Height |
40 |
Outlet Gates |
None |
Hazard Potential |
Significant |
Foundations |
Rock |
Nid Height |
40 |
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.
Lake Joy Dam