L & N Reservoir
Key Takeaway
L & N Reservoir is classified as high hazard in Illinois. It was completed in 1910 and is 116 years old. Its primary use is water supply. 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 | 25 ft (taller than 42.6% in IL) |
| Dam Length | 720 ft |
| Dam Type | Earth |
| Max Storage | 353 acre-ft |
| Normal Storage | 182 acre-ft |
| Max Discharge | 607 cfs |
| Year Completed | 1910 (116 years old) |
| NID ID | IL00173 |
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
CITY OF MOUNT VERNON
Local Government
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What is the hazard classification of L & N Reservoir?
L & N Reservoir 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 L & N Reservoir?
L & N Reservoir is owned by CITY OF MOUNT VERNON (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was L & N Reservoir built?
L & N Reservoir was completed in 1910, making it 116 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 L & N Reservoir?
L & N Reservoir serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is L & N Reservoir?
L & N Reservoir has a dam height of 25 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 L & N Reservoir last inspected?
L & N Reservoir was last inspected on April 12, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.