Melvern Dam Reservoir Report

Last Updated: December 6, 2025

Melvern Dam, also known as Melvern Lake, is a Federal-owned structure located in Osage County, Kansas, along the Marais des Cygnes River.


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Summary

Completed in 1972, this Earth-type dam stands at a hydraulic height of 123 feet, with a structural height of 98 feet and a length of 9750 feet. It has a storage capacity of 363,000 acre-feet and serves multiple purposes including flood risk reduction, recreation, and water supply.

Managed by the US Army Corps of Engineers, Melvern Dam poses a high hazard potential and undergoes regular inspections and risk assessment measures to ensure its structural integrity. The dam's emergency action plan is meticulously maintained, emphasizing the importance of public awareness and preparedness in the event of a dam-related emergency. USACE works closely with local authorities to develop evacuation plans and conduct necessary repairs to mitigate flood risks associated with the dam.

Despite the risks, Melvern Dam plays a crucial role in managing water levels and alleviating pressure during severe weather events. With a focus on proactive risk management and continual maintenance, the dam remains a vital asset in protecting the surrounding communities from potential flooding incidents.

Year Completed

1972

Dam Length

9750

River Or Stream

MARAIS DES CYGNES

Primary Dam Type

Earth

Surface Area

6930

Hydraulic Height

123

Drainage Area

349

Nid Storage

363000

Structural Height

98

Outlet Gates

Uncontrolled - 0

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

123
       
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.