Magin Lake Dam Reservoir Report

Last Updated: December 6, 2025

Magin Lake Dam, located in Collinsville, Illinois, was completed in 1968 by the USDA NRCS and serves as a recreational water resource for the region.


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Summary

The dam stands at a height of 37 feet and has a length of 252 feet, with a storage capacity of 151 acre-feet. The primary purpose of the dam is for recreation, and it is classified as an earth dam with a buttress core type.

Managed by the Illinois Department of Natural Resources, Magin Lake Dam is regulated, inspected, and enforced by state authorities to ensure its safety and compliance with regulations. The dam has a low hazard potential rating and a moderate risk assessment score of 3, indicating a stable structure with some potential risks. The spillway of the dam is uncontrolled, with a width of 21 feet, and it is situated on the Tributary of Canteen Creek.

Overall, Magin Lake Dam provides a valuable recreational resource for the local community while also serving as an important water management structure. With regular inspections and state oversight, the dam remains a safe and reliable feature in the region's water resource infrastructure, contributing to the overall water and climate resilience of the area.

Year Completed

1968

Dam Length

252

Dam Height

37

River Or Stream

TRIB CANTEEN CREEK

Primary Dam Type

Earth

Nid Storage

151

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

37
       
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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.