Old Longs Mill Dam
Key Takeaway
Old Longs Mill Dam is classified as significant hazard in Indiana. It was completed in 1930 and is 96 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 20 ft (taller than 23% in IN) |
| Dam Length | 200 ft |
| Dam Type | Earth |
| Max Storage | 81 acre-ft |
| Normal Storage | 41 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1930 (96 years old) |
| NID ID | IN00793 |
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
CAROL SIEMION
Private
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Low Hazard 9 ftFrequently Asked Questions
What is the hazard classification of Old Longs Mill Dam?
Old Longs Mill 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 Old Longs Mill Dam?
Old Longs Mill Dam is owned by CAROL SIEMION (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Old Longs Mill Dam built?
Old Longs Mill Dam was completed in 1930, making it 96 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 Old Longs Mill Dam?
Old Longs Mill 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 Old Longs Mill Dam?
Old Longs Mill Dam has a dam height of 20 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 Old Longs Mill Dam last inspected?
Old Longs Mill Dam was last inspected on January 9, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.