Oak Lake Estates Dam Reservoir Report

Last Updated: December 5, 2025

Located in Tazewell, Illinois, the Oak Lake Estates Dam stands as a private recreational structure along the tributary of Lost Creek.


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Summary

Built in 1978, this earth dam spans 400 feet in length and reaches a height of 30 feet, providing a storage capacity of 150 acre-feet for the surrounding area. The dam's primary purpose is for recreation, offering a serene escape for water resource and climate enthusiasts to enjoy.

Managed by the Illinois Department of Natural Resources, the Oak Lake Estates Dam has been deemed low-hazard with a moderate risk assessment rating of 3. Although its condition assessment is currently unavailable, the dam undergoes regular inspections every five years to ensure its structural integrity and safety. With uncontrolled spillways and outlet gates, this dam serves as a vital piece of infrastructure for the community, offering a peaceful retreat amidst the natural beauty of the Illinois landscape.

As a key feature of the region's water resource management, the Oak Lake Estates Dam plays a crucial role in maintaining the environmental balance and recreational opportunities in the area. With its tranquil waters and picturesque surroundings, this dam is a testament to the intersection of human ingenuity and nature's beauty, making it a must-visit destination for water resource and climate enthusiasts looking to explore the wonders of Illinois' landscape.

Year Completed

1978

Dam Length

400

Dam Height

30

River Or Stream

TRIB LOST CREEK

Primary Dam Type

Earth

Nid Storage

150

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

30
       
Seasonal Comparison

Weather Forecast

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.