Kinmundy Lake Dam Reservoir Report

Last Updated: December 5, 2025

Kinmundy Lake Dam, located in Marion, Illinois, was completed in 1885 by the Illinois Central Railroad and stands at a height of 25 feet.


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Summary

This earth dam, primarily used for recreation, spans a length of 1050 feet and has a storage capacity of 121 acre-feet. The dam is situated on the Tributary East Fork Kaskaskia River, providing a beautiful setting for outdoor enthusiasts to enjoy the surrounding natural environment.

Managed by the local government and regulated by the Illinois Department of Natural Resources, Kinmundy Lake Dam has a low hazard potential and a moderate risk assessment rating. The dam features an uncontrolled spillway with a width of 80 feet, and outlet gates that are also uncontrolled. Despite its age, the dam is inspected every five years to ensure its structural integrity and safety. While the condition assessment and emergency action plan information are not currently available, the dam continues to serve as a vital resource for the community's recreational activities.

With its historical significance and scenic location, Kinmundy Lake Dam offers a serene escape for water resource and climate enthusiasts. The dam's role in providing recreational opportunities, as well as its importance in flood control and water management, underscores its value to the local community. As efforts continue to monitor and maintain the dam's safety and functionality, Kinmundy Lake remains a treasured destination for nature lovers and outdoor adventurers alike.

Year Completed

1885

Dam Length

1050

Dam Height

25

River Or Stream

TRIB EAST FORK KASKASKIA RIVER

Primary Dam Type

Earth

Nid Storage

121

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

25
       
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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.