Country Commons Park Basin Dam Reservoir Report

Last Updated: December 5, 2025

Country Commons Park Basin Dam, located in NAPERVILLE, Illinois, along the STEEPLE RUN river, serves as a crucial flood risk reduction infrastructure in DuPage County.


°F

°F

mph

Wind

%

Humidity

Summary

Built in 2004, this Earth-type dam stands at a height of 8 feet and spans 1050 feet, providing a storage capacity of 54 acre-feet to help mitigate potential flood events in the area. The dam is owned and regulated by the local government, with the Illinois Department of Natural Resources overseeing its permitting, inspection, and enforcement processes.

Despite its relatively modest size, the Country Commons Park Basin Dam is classified as having a high hazard potential due to its location and function. The dam does not feature controlled spillways, and its condition assessment is currently marked as "Not Available," highlighting the need for regular monitoring and maintenance. While an Emergency Action Plan (EAP) exists for the dam, its last revision dates back to 2012, raising concerns about the adequacy of emergency preparedness measures in case of a potential breach. Overall, the dam presents a moderate risk level (3) according to risk assessments, underscoring the importance of ongoing risk management efforts to ensure the safety and integrity of this critical water resource infrastructure.

Year Completed

2004

Dam Length

1050

Dam Height

8

River Or Stream

STEEPLE RUN

Primary Dam Type

Earth

Nid Storage

54

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

8
       
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.