Midlothian Creek Dam Reservoir Report

Last Updated: December 5, 2025

Midlothian Creek Dam, also known as Twin Lakes, is a local government-owned structure located in Oak Forest, Illinois.


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Summary

Completed in 1975, the dam has a primary purpose of flood risk reduction along the Midlothian Creek. Standing at 22 feet high and with a length of 1515 feet, the earth dam plays a crucial role in managing water flow and protecting the surrounding area from potential flooding events.

Managed by the Illinois Department of Natural Resources, the Midlothian Creek Dam is regulated, inspected, and enforced by the state to ensure its safety and functionality. With a storage capacity of 1279 acre-feet, the dam not only serves as a flood control structure but also offers recreational opportunities in the area. Despite its high hazard potential, the dam's risk assessment is rated as moderate, indicating the need for continued monitoring and maintenance to mitigate any potential risks.

The dam's uncontrolled spillway, with a width of 500 feet, allows for the safe release of excess water during peak flow events. Although the condition assessment is not available, the dam's emergency action plan was last revised in 1983. With its strategic location and vital role in flood risk reduction, the Midlothian Creek Dam stands as a critical infrastructure in safeguarding the community and the environment from the impacts of extreme weather events and water resource management.

Year Completed

1975

Dam Length

1515

Dam Height

22

River Or Stream

MIDLOTHIAN CREEK

Primary Dam Type

Earth

Surface Area

30

Drainage Area

10.7

Nid Storage

1279

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

22
       
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.
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