Grand Oaks Lake Dam Reservoir Report

Last Updated: December 5, 2025

Grand Oaks Lake Dam, located in North Pekin, Illinois, is a privately owned structure built in 1978 for recreational purposes.


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Summary

Standing at a height of 22 feet and spanning 285 feet in length, this earth dam holds a maximum storage capacity of 52 acre-feet and covers a surface area of 5 acres. Situated on Trib Lick Creek, the dam is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its safety and compliance with state regulations.

Despite its uncontrolled spillway type and significant hazard potential, Grand Oaks Lake Dam has a moderate risk rating of 3. The dam's primary purpose is to provide recreational opportunities for the community, offering a serene oasis for water resource and climate enthusiasts to enjoy. While the condition assessment is currently not available, the dam's emergency action plan was last revised in 2005, emphasizing the importance of preparedness and risk management measures in case of any unforeseen events.

Managed by private owners, Grand Oaks Lake Dam serves as a vital water resource in Tazewell County, Illinois, supporting a drainage area of 0.5 square miles. With its picturesque location and historical significance, the dam stands as a testament to the intersection of human engineering and natural beauty, inviting visitors to appreciate the delicate balance between water conservation and recreational enjoyment in this tranquil setting.

Year Completed

1978

Dam Length

285

Dam Height

22

River Or Stream

TRIB LICK CREEK

Primary Dam Type

Earth

Surface Area

5

Drainage Area

0.5

Nid Storage

52

Outlet Gates

Uncontrolled

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

22
       
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.