Stonehenge Lake Dam
Key Takeaway
Stonehenge Lake Dam is classified as significant hazard in Illinois. It was completed in 2008 and is 18 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 33 ft (taller than 71.6% in IL) |
| Dam Length | 320 ft |
| Dam Type | Earth |
| Max Storage | 200 acre-ft |
| Normal Storage | 95 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 2,846 cfs |
| Year Completed | 2008 (18 years old) |
| NID ID | IL50575 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
STONEHENGE LAND TRUST II
Private
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Low Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Stonehenge Lake Dam?
Stonehenge Lake Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Stonehenge Lake Dam?
Stonehenge Lake Dam is owned by STONEHENGE LAND TRUST II (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Stonehenge Lake Dam built?
Stonehenge Lake Dam was completed in 2008, making it 18 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 Stonehenge Lake Dam?
Stonehenge 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 Stonehenge Lake Dam?
Stonehenge Lake Dam has a dam height of 33 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 Stonehenge Lake Dam last inspected?
Stonehenge Lake Dam was last inspected on June 8, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.