Arrowhead Lake Dam
Key Takeaway
Arrowhead Lake Dam is classified as significant hazard in Illinois. It was completed in 1963 and is 63 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 16 ft (taller than 20.3% in IL) |
| Dam Length | 840 ft |
| Dam Type | Earth |
| Max Storage | 355 acre-ft |
| Normal Storage | 162 acre-ft |
| Surface Area | 39 acres |
| Year Completed | 1963 (63 years old) |
| NID ID | IL00087 |
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
CITY OF JOHNSTON CITY
Private
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High Hazard 88 ftFrequently Asked Questions
What is the hazard classification of Arrowhead Lake Dam?
Arrowhead 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 Arrowhead Lake Dam?
Arrowhead Lake Dam is owned by CITY OF JOHNSTON CITY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Arrowhead Lake Dam built?
Arrowhead Lake Dam was completed in 1963, making it 63 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 Arrowhead Lake Dam?
Arrowhead 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 Arrowhead Lake Dam?
Arrowhead Lake Dam has a dam height of 16 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 Arrowhead Lake Dam last inspected?
Arrowhead Lake Dam was last inspected on June 29, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.