Mallen Lake Dam Reservoir Report
Last Updated: December 15, 2025
Mallen Lake Dam, located in Platte City, Missouri, was completed in 1979 to serve as a flood risk reduction structure along the TR-CASTILLE CREEK.
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Summary
This private-owned Earth dam stands at 25 feet tall and spans 445 feet in length, with a storage capacity of 125 acre-feet. While primarily designed for flood risk reduction, the dam also caters to fire protection, stock, small fish and wildlife pond, grade stabilization, and recreational purposes.
With a hazard potential rated as low and a moderate risk assessment score of 3, Mallen Lake Dam is currently not condition assessed or inspected. Despite being unregulated by the state, this dam plays a crucial role in managing water resources for the Clinton County community. The dam's uncontrolled spillway with a width of 23 feet ensures efficient water discharge during peak flow events, contributing to the overall safety and sustainability of the surrounding areas.
As water resource and climate enthusiasts, Mallen Lake Dam serves as a notable structure in the Rock Island District, providing essential flood protection and water storage for the local ecosystem. With its strategic location and purposeful design, this Earth dam stands as a testament to effective water management practices in Missouri, safeguarding the community against potential water-related hazards while supporting various recreational and environmental benefits.
Year Completed |
1979 |
Dam Length |
445 |
Dam Height |
25 |
River Or Stream |
TR-CASTILLE CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
25 |
Drainage Area |
90 |
Nid Storage |
125 |
Structural Height |
25 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
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.
Mallen Lake Dam