Willow Lake Dam
Key Takeaway
Willow Lake Dam is classified as high hazard in Illinois. It was completed in 1974 and is 52 years old. Its primary use is other. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 25 ft (taller than 42.6% in IL) |
| Dam Length | 590 ft |
| Dam Type | Earth |
| Max Storage | 299 acre-ft |
| Normal Storage | 165 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 2,313 cfs |
| Year Completed | 1974 (52 years old) |
| NID ID | IL01205 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
WILLOW LAKE ASSOCIATION
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Willow Lake Dam?
Willow Lake Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Willow Lake Dam?
Willow Lake Dam is owned by WILLOW LAKE ASSOCIATION (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Willow Lake Dam built?
Willow Lake Dam was completed in 1974, making it 52 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 Willow Lake Dam?
Willow Lake Dam serves the following purposes: Other, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Willow Lake Dam?
Willow Lake Dam has a dam height of 25 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 Willow Lake Dam last inspected?
Willow Lake Dam was last inspected on August 7, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.