Lake Jacksonville Dam
Key Takeaway
Lake Jacksonville Dam is classified as significant hazard in Illinois. It was completed in 1939 and is 87 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 54 ft (taller than 93.2% in IL) |
| Dam Length | 980 ft |
| Dam Type | Earth |
| Max Storage | 12.8K acre-ft |
| Normal Storage | 6.1K acre-ft |
| Surface Area | 477 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 14,582 cfs |
| Year Completed | 1939 (87 years old) |
| NID ID | IL00711 |
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 JACKSONVILLE
Local Government
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Low Hazard 26 ftFrequently Asked Questions
What is the hazard classification of Lake Jacksonville Dam?
Lake Jacksonville 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 Lake Jacksonville Dam?
Lake Jacksonville Dam is owned by CITY OF JACKSONVILLE (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Jacksonville Dam built?
Lake Jacksonville Dam was completed in 1939, making it 87 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 Jacksonville Dam?
Lake Jacksonville Dam serves the following purposes: Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lake Jacksonville Dam?
Lake Jacksonville Dam has a dam height of 54 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 Jacksonville Dam last inspected?
Lake Jacksonville Dam was last inspected on April 27, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.