Harrisburg-Sahara Retention Impoundment Dam
Key Takeaway
Harrisburg-Sahara Retention Impoundment Dam is classified as significant hazard in Illinois. It was completed in 2003 and is 23 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 | 25 ft (taller than 42.6% in IL) |
| Dam Length | 1,200 ft |
| Dam Type | Earth |
| Max Storage | 959 acre-ft |
| Normal Storage | 465 acre-ft |
| Surface Area | 70 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 2003 (23 years old) |
| NID ID | IL50498 |
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
CITY OF HARRISBURG
Local Government
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What is the hazard classification of Harrisburg-Sahara Retention Impoundment Dam?
Harrisburg-Sahara Retention Impoundment 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 Harrisburg-Sahara Retention Impoundment Dam?
Harrisburg-Sahara Retention Impoundment Dam is owned by CITY OF HARRISBURG (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Harrisburg-Sahara Retention Impoundment Dam built?
Harrisburg-Sahara Retention Impoundment Dam was completed in 2003, making it 23 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 Harrisburg-Sahara Retention Impoundment Dam?
Harrisburg-Sahara Retention Impoundment Dam serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Harrisburg-Sahara Retention Impoundment Dam?
Harrisburg-Sahara Retention Impoundment Dam 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 Harrisburg-Sahara Retention Impoundment Dam last inspected?
Harrisburg-Sahara Retention Impoundment Dam was last inspected on October 2, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.