New Harrisburg Reservoir Dam
Key Takeaway
New Harrisburg Reservoir Dam is classified as significant hazard in Illinois. It was completed in 1955 and is 71 years old. Its primary use is other. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 38 ft (taller than 80.7% in IL) |
| Dam Length | 1,000 ft |
| Dam Type | Earth |
| Max Storage | 6.2K acre-ft |
| Normal Storage | 2.1K acre-ft |
| Surface Area | 218 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 8,804 cfs |
| Year Completed | 1955 (71 years old) |
| NID ID | IL00017 |
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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Low Hazard 22 ftFrequently Asked Questions
What is the hazard classification of New Harrisburg Reservoir Dam?
New Harrisburg Reservoir 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 New Harrisburg Reservoir Dam?
New Harrisburg Reservoir Dam is owned by CITY OF HARRISBURG (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was New Harrisburg Reservoir Dam built?
New Harrisburg Reservoir Dam was completed in 1955, making it 71 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 New Harrisburg Reservoir Dam?
New Harrisburg Reservoir Dam serves the following purposes: Other, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is New Harrisburg Reservoir Dam?
New Harrisburg Reservoir Dam has a dam height of 38 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 New Harrisburg Reservoir Dam last inspected?
New Harrisburg Reservoir Dam was last inspected on November 2, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.