Harrisburg Reservoir Dam
Key Takeaway
Harrisburg Reservoir Dam is classified as low hazard in Illinois. It was completed in 1920 and is 106 years old. Its primary use is other.
Physical Details
| Dam Height | 25 ft (taller than 42.6% in IL) |
| Dam Length | 8,400 ft |
| Dam Type | Earth |
| Max Storage | 887 acre-ft |
| Normal Storage | 798 acre-ft |
| Surface Area | 73 acres |
| Drainage Area | 88 sq mi |
| Max Discharge | 50 cfs |
| Year Completed | 1920 (106 years old) |
| NID ID | IL00960 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
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 36 ftFrequently Asked Questions
What is the hazard classification of Harrisburg Reservoir Dam?
Harrisburg Reservoir Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Harrisburg Reservoir Dam?
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 Harrisburg Reservoir Dam built?
Harrisburg Reservoir Dam was completed in 1920, making it 106 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 Reservoir Dam?
Harrisburg Reservoir Dam serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Harrisburg Reservoir Dam?
Harrisburg Reservoir 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 Reservoir Dam last inspected?
Harrisburg Reservoir Dam was last inspected on July 23, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.