Cedar Glen Unit 2 Dam Reservoir Report

Last Updated: December 5, 2025

Located in Romeoville, Illinois, the Cedar Glen Unit 2 Dam, also known as Cedar Glen Unit 2 Detention Pond, was completed in 1985 by PAVIA-MARTING & CO.


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Summary

The dam stands at a height of 11 feet and has a length of 460 feet, serving primarily for flood risk reduction along the Spring Brook river or stream. With a maximum storage capacity of 75 acre-feet and a low hazard potential, this private-owned dam is regulated by the Illinois Department of Natural Resources (IDNR) and undergoes regular inspections to ensure its structural integrity.

Despite its primary purpose of flood risk reduction, the Cedar Glen Unit 2 Dam also offers recreational opportunities in the surrounding area. Its uncontrolled spillway type, with a width of 9 feet, allows for controlled discharge during periods of high water levels. The dam's risk assessment indicates a moderate level of risk (3), prompting the implementation of risk management measures to mitigate any potential hazards. Overall, the Cedar Glen Unit 2 Dam plays a crucial role in protecting the local community from flooding while simultaneously providing a recreational space for residents to enjoy.

Year Completed

1985

Dam Length

460

Dam Height

11

River Or Stream

SPRING BROOK

Primary Dam Type

Other

Nid Storage

75

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

11
       
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.