Hollis Park Dam
Key Takeaway
Hollis Park Dam is classified as high hazard in Illinois. It was completed in 1982 and is 44 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 | 51 ft (taller than 92.4% in IL) |
| Dam Length | 700 ft |
| Dam Type | Earth |
| Max Storage | 820 acre-ft |
| Normal Storage | 335 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 534 sq mi |
| Max Discharge | 4,686 cfs |
| Year Completed | 1982 (44 years old) |
| NID ID | IL01005 |
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
HOLLIS PARK DISTRICT
Private
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High Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Hollis Park Dam?
Hollis Park 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 Hollis Park Dam?
Hollis Park Dam is owned by HOLLIS PARK DISTRICT (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hollis Park Dam built?
Hollis Park Dam was completed in 1982, making it 44 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 Hollis Park Dam?
Hollis Park 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 Hollis Park Dam?
Hollis Park Dam has a dam height of 51 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 Hollis Park Dam last inspected?
Hollis Park Dam was last inspected on May 4, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.