Lake Tanglewood Dam
Key Takeaway
Lake Tanglewood Dam is classified as high hazard in Illinois. It was completed in 1969 and is 57 years old. Its primary use is recreation. 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 | 40 ft (taller than 83.1% in IL) |
| Dam Length | 375 ft |
| Dam Type | Earth |
| Max Storage | 161 acre-ft |
| Normal Storage | 97 acre-ft |
| Year Completed | 1969 (57 years old) |
| NID ID | IL00460 |
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
LAKE WILDWOOD ASSOCIATION, INC.
Private
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High Hazard 86 ftFrequently Asked Questions
What is the hazard classification of Lake Tanglewood Dam?
Lake Tanglewood 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 Lake Tanglewood Dam?
Lake Tanglewood Dam is owned by LAKE WILDWOOD ASSOCIATION, INC. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Tanglewood Dam built?
Lake Tanglewood Dam was completed in 1969, making it 57 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 Lake Tanglewood Dam?
Lake Tanglewood Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lake Tanglewood Dam?
Lake Tanglewood Dam has a dam height of 40 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 Lake Tanglewood Dam last inspected?
Lake Tanglewood Dam was last inspected on May 10, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.