Gateway Medical Lake Dam Reservoir Report

Last Updated: December 6, 2025

Gateway Medical Lake Dam, located in Madison County, Illinois, is a privately owned structure designed by TW&M with a primary purpose of recreation.


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Summary

Completed in 1939, this earth dam stands at a height of 31 feet and has a length of 230 feet, creating a reservoir with a storage capacity of 26.45 acre-feet. The dam is regulated by the Illinois Department of Natural Resources and is inspected regularly to ensure safety and compliance with state regulations.

With a hazard potential rated as high and a moderate risk assessment score of 3, Gateway Medical Lake Dam is considered a critical infrastructure for the surrounding community. Although the condition assessment is currently unavailable, emergency action plans have been prepared and updated periodically to mitigate potential risks. The dam's location on TRIB CAHOKIA CREEK provides recreational opportunities for locals and visitors, making it a valuable asset for water resource and climate enthusiasts to explore and appreciate.

In conclusion, Gateway Medical Lake Dam serves as an important recreational facility in the Edwardsville area, offering both leisure activities and critical water resource management functions. As a privately owned structure with state oversight, the dam plays a crucial role in maintaining the safety and well-being of the community. Climate enthusiasts and water resource advocates can appreciate the dam's significance in providing both recreational enjoyment and essential water storage capabilities in the region.

Year Completed

1939

Dam Length

230

Dam Height

31

River Or Stream

TRIB CAHOKIA CREEK

Primary Dam Type

Earth

Drainage Area

0.04

Nid Storage

26.45

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

31
       
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.