Long Lake Dam
Key Takeaway
Long Lake Dam is classified as low hazard in Illinois. It was completed in 1965 and is 61 years old. Its primary use is recreation.
Physical Details
| Dam Height | 20 ft (taller than 28.2% in IL) |
| Dam Length | 236 ft |
| Dam Type | Earth |
| Max Storage | 140 acre-ft |
| Normal Storage | 80 acre-ft |
| Year Completed | 1965 (61 years old) |
| NID ID | IL01120 |
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
WEE-MA-TUK HILLS INC.
Private
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Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Long Lake Dam?
Long 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 Long Lake Dam?
Long Lake Dam is owned by WEE-MA-TUK HILLS INC. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Long Lake Dam built?
Long Lake Dam was completed in 1965, making it 61 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 Long Lake Dam?
Long Lake 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 Long Lake Dam?
Long Lake Dam has a dam height of 20 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 Long Lake Dam last inspected?
Long Lake Dam was last inspected on April 29, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.