Knox County Conservation Club Lake Dam Reservoir Report

Last Updated: December 18, 2025

Located in Ellisville, Illinois, Knox County Conservation Club Lake Dam is a privately-owned earth dam that was completed in 1958 with a primary purpose of recreation.


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Summary

The dam stands at a height of 33 feet and has a length of 275 feet, creating a reservoir with a normal storage capacity of 109 acre-feet. The dam overlooks the Trib Cedar Creek and is regulated by the Illinois Department of Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.

With a low hazard potential and a moderate risk assessment rating, Knox County Conservation Club Lake Dam remains a popular spot for water resource and climate enthusiasts interested in exploring the beauty of this man-made structure in Knox County, Illinois. Despite limited information on its condition assessment, the dam's uncontrolled spillway and outlet gates provide a glimpse into the engineering marvel behind its design. Whether for leisurely activities or appreciation of its hydraulic features, the dam offers a unique opportunity to engage with water conservation efforts in the region.

Year Completed

1958

Dam Length

275

Dam Height

33

River Or Stream

TRIB CEDAR CREEK

Primary Dam Type

Earth

Nid Storage

183

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

33
       
Seasonal Comparison

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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.