June Lake Dam Reservoir Report
Nearby: Lake Sara Dam Little Wabash River Dam
Last Updated: December 5, 2025
June Lake Dam in Effingham, Illinois, is a private-owned structure that serves primarily for recreation purposes.
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Summary
The dam, which is an earth-type structure with a height of 20 feet and a length of 315 feet, has a storage capacity of 35 acre-feet. It is regulated by the Illinois Department of Natural Resources (IDNR) and undergoes regular inspections to ensure its safety and compliance with state regulations.
Located on TRIB LILY CR in the St. Louis District, June Lake Dam is classified as having a significant hazard potential and a moderate risk assessment rating. Despite its uncontrolled spillway type, the dam has not been modified in recent years, and its condition assessment is currently not available. The last inspection in October 2020 noted a inspection frequency of 3 years, indicating ongoing monitoring and maintenance efforts to mitigate any potential risks associated with the dam.
With its picturesque setting and potential for outdoor activities, June Lake Dam is a popular destination for water resource and climate enthusiasts. While its hazard potential and risk assessment highlight the importance of diligent management and oversight, the dam continues to provide recreational opportunities for visitors in the Effingham area.
Dam Length |
315 |
Dam Height |
20 |
River Or Stream |
TRIB LILY CR |
Primary Dam Type |
Earth |
Nid Storage |
35 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
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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.
June Lake Dam