Alton Twin Lakes-South Lake Dam
Key Takeaway
Alton Twin Lakes-South Lake Dam is classified as significant hazard in Illinois. It was completed in 1970 and is 56 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 32 ft (taller than 69.5% in IL) |
| Dam Length | 300 ft |
| Dam Type | Earth |
| Max Storage | 200 acre-ft |
| Normal Storage | 130 acre-ft |
| Year Completed | 1970 (56 years old) |
| NID ID | IL00426 |
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
HAROLD KINNARD
Private
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Low Hazard 32 ftFrequently Asked Questions
What is the hazard classification of Alton Twin Lakes-South Lake Dam?
Alton Twin Lakes-South 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 Alton Twin Lakes-South Lake Dam?
Alton Twin Lakes-South Lake Dam is owned by HAROLD KINNARD (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Alton Twin Lakes-South Lake Dam built?
Alton Twin Lakes-South Lake Dam was completed in 1970, making it 56 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 Alton Twin Lakes-South Lake Dam?
Alton Twin Lakes-South 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 Alton Twin Lakes-South Lake Dam?
Alton Twin Lakes-South Lake Dam has a dam height of 32 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 Alton Twin Lakes-South Lake Dam last inspected?
Alton Twin Lakes-South Lake Dam was last inspected on May 3, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.