Leisure Oak Lake 2 Dam Reservoir Report

Last Updated: December 5, 2025

Leisure Oak Lake 2 Dam, located in Peoria, Illinois, is a privately owned structure primarily designed for recreational purposes.


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Summary

Completed in 1965, this Earth dam stands at a height of 31 feet and spans 216 feet in length, providing a storage capacity of 41 acre-feet. The dam overlooks the TRIB EAST BRANCH LAMARSH CREEK and is regulated by the Illinois Department of Natural Resources, with state permitting, inspection, and enforcement in place.

Despite its low hazard potential, Leisure Oak Lake 2 Dam poses a moderate risk according to a risk assessment rating of (3). While the condition assessment is currently unavailable, the dam's emergency action plan status, inundation maps, and risk management measures are not fully updated or meeting guidelines. With an uncontrolled spillway and outlet gates, the dam's last inspection in September 2018 suggests a need for regular monitoring and maintenance to ensure its safety and functionality for the surrounding area.

For water resource and climate enthusiasts, Leisure Oak Lake 2 Dam presents an interesting case study of a privately owned recreational structure with historical significance. Understanding its design, regulatory framework, and risk assessment can provide valuable insights into the management and maintenance of similar dams in the region. Further research and action may be needed to address any potential vulnerabilities and ensure the long-term resilience of this important water resource infrastructure.

Year Completed

1965

Dam Length

216

Dam Height

31

River Or Stream

TRIB EAST BRANCH LAMARSH CREEK

Primary Dam Type

Earth

Nid Storage

41

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

31
       
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.