Rocky Run Lake Dam
Key Takeaway
Rocky Run Lake Dam is classified as significant hazard in Illinois. It was completed in 1971 and is 55 years old. Its primary use is flood risk reduction. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 69 ft (taller than 97.2% in IL) |
| Dam Length | 596 ft |
| Dam Type | Earth |
| Max Storage | 520 acre-ft |
| Normal Storage | 164 acre-ft |
| Year Completed | 1971 (55 years old) |
| NID ID | IL00111 |
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
HUNT-LIMA DRAINAGE DISTRICT
Local Government
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Significant Hazard 48 ftFrequently Asked Questions
What is the hazard classification of Rocky Run Lake Dam?
Rocky Run 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 Rocky Run Lake Dam?
Rocky Run Lake Dam is owned by HUNT-LIMA DRAINAGE DISTRICT (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Rocky Run Lake Dam built?
Rocky Run Lake Dam was completed in 1971, making it 55 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 Rocky Run Lake Dam?
Rocky Run Lake Dam serves the following purposes: Flood Risk Reduction, Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Rocky Run Lake Dam?
Rocky Run Lake Dam has a dam height of 69 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 Rocky Run Lake Dam last inspected?
Rocky Run Lake Dam was last inspected on May 17, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.