Woodscreek Detention Dam Reservoir Report

Last Updated: December 13, 2025

Woodscreek Detention Dam, located in Lake in the Hills, Illinois, was completed in 1991 with a primary purpose of flood risk reduction along the Woods Creek tributary.


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Summary

Designed by YORK ENGINEERING, this earth dam stands at 13 feet in height and spans 300 feet in length, providing a maximum storage capacity of 125 acre-feet. The dam's spillway, with a width of 6 feet, is of the uncontrolled type, allowing for a maximum discharge of 252 cubic feet per second.

Managed by the local government, Woodscreek Detention Dam is regulated by the Illinois Department of Natural Resources (IDNR) and undergoes regular inspections every 5 years. Despite its low hazard potential, the dam is considered to have a moderate risk level, with specific risk management measures yet to be determined. While the condition assessment is currently unavailable, the dam's emergency action plan (EAP) status, as well as its inundation maps and risk assessment, are also pending updates. As an essential structure in mitigating flood risks in the region, Woodscreek Detention Dam plays a crucial role in safeguarding the community against potential water-related disasters.

Year Completed

1991

Dam Length

300

Dam Height

13

River Or Stream

TRIB WOODS CREEK

Primary Dam Type

Earth

Nid Storage

125

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

13
       
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.