Gw60 Dam Reservoir Report

Last Updated: December 5, 2025

Gw60 Dam, located in Winfield, Illinois, is a crucial structure owned by the local government for flood risk reduction along the Trib 3 West Branch DuPage River.


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Summary

Designed by MTA & ERA, this Earth dam stands at 14 feet high and spans 1000 feet in length. With a storage capacity of 558 acre-feet and a surface area of 17.3 acres, Gw60 Dam plays a significant role in managing water resources in the region.

The dam, regulated by the Illinois Department of Natural Resources, is classified as having low hazard potential and moderate risk. While currently in a condition assessment of "Not Available," the structure is inspected every 5 years to ensure its safety and functionality. With no outlet gates and an uncontrolled spillway, the dam is designed to mitigate flooding and protect the surrounding area from potential water-related risks.

As a key component in the local water management system, Gw60 Dam serves multiple purposes including flood risk reduction and providing a habitat for fish and wildlife. Supported by federal funding and oversight from the Chicago District US Army Corps of Engineers, this structure is essential for protecting the community from water-related emergencies and ensuring sustainable water resource management in the region.

Dam Length

1000

Dam Height

14

River Or Stream

TRIB 3 WEST BRANCH DUPAGE R

Primary Dam Type

Earth

Surface Area

17.3

Drainage Area

0.9

Nid Storage

558

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

14
       
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.