Wilmington Dam
Key Takeaway
Wilmington Dam is classified as low hazard in Illinois. It was completed in 1920 and is 106 years old. Its primary use is recreation.
Physical Details
| Dam Height | 12 ft (taller than 10% in IL) |
| Dam Length | 1,000 ft |
| Dam Type | Gravity |
| Max Storage | 1.2K acre-ft |
| Normal Storage | 0 acre-ft |
| Year Completed | 1920 (106 years old) |
| NID ID | IL50319 |
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
CITY OF WILMINGTON
Local Government
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Significant Hazard 15 ftFrequently Asked Questions
What is the hazard classification of Wilmington Dam?
Wilmington 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 Wilmington Dam?
Wilmington Dam is owned by CITY OF WILMINGTON (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Wilmington Dam built?
Wilmington Dam was completed in 1920, making it 106 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 Wilmington Dam?
Wilmington 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 Wilmington Dam?
Wilmington Dam has a dam height of 12 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 Wilmington Dam last inspected?
Wilmington Dam was last inspected on May 18, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.