Washington County Lake Dam
Key Takeaway
Washington County Lake Dam is classified as low hazard in Illinois. It was completed in 1962 and is 64 years old. Its primary use is recreation.
Physical Details
| Dam Height | 26 ft (taller than 47.1% in IL) |
| Dam Length | 640 ft |
| Dam Type | Earth |
| Max Storage | 4.2K acre-ft |
| Normal Storage | 1.4K acre-ft |
| Year Completed | 1962 (64 years old) |
| NID ID | IL00139 |
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
ILLINOIS DEPARTMENT OF NATURAL RESOURCES
State Government
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Low Hazard 28 ftFrequently Asked Questions
What is the hazard classification of Washington County Lake Dam?
Washington County Lake 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 Washington County Lake Dam?
Washington County Lake Dam is owned by ILLINOIS DEPARTMENT OF NATURAL RESOURCES (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Washington County Lake Dam built?
Washington County Lake Dam was completed in 1962, making it 64 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 Washington County Lake Dam?
Washington County 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 Washington County Lake Dam?
Washington County Lake Dam has a dam height of 26 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 Washington County Lake Dam last inspected?
Washington County Lake Dam was last inspected on August 17, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.