Main Lake Dam
Key Takeaway
Main Lake Dam is classified as low hazard in Illinois. It was completed in 1976 and is 50 years old. Its primary use is water supply.
Physical Details
| Dam Height | 28 ft (taller than 54.6% in IL) |
| Dam Length | 2,200 ft |
| Dam Type | Earth |
| Max Storage | 1.3K acre-ft |
| Normal Storage | 694 acre-ft |
| Year Completed | 1976 (50 years old) |
| NID ID | IL00935 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
INLAND STEEL COMPANY
Private
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Low Hazard 26 ftFrequently Asked Questions
What is the hazard classification of Main Lake Dam?
Main Lake Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Main Lake Dam?
Main Lake Dam is owned by INLAND STEEL COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Main Lake Dam built?
Main Lake Dam was completed in 1976, making it 50 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Main Lake Dam?
Main Lake Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Main Lake Dam?
Main Lake Dam has a dam height of 28 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Main Lake Dam last inspected?
Main Lake Dam was last inspected on December 19, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.