St. Clair County Retention Pond 1 Dam
Key Takeaway
St. Clair County Retention Pond 1 Dam is classified as high hazard in Illinois. It was completed in 1999 and is 27 years old. Its primary use is recreation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 31 ft (taller than 66.2% in IL) |
| Dam Length | 500 ft |
| Dam Type | Earth |
| Max Storage | 191 acre-ft |
| Normal Storage | 43 acre-ft |
| Max Discharge | 1,660 cfs |
| Year Completed | 1999 (27 years old) |
| NID ID | IL50263 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
ST. CLAIR COUNTY
Private
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Significant Hazard 23 ftFrequently Asked Questions
What is the hazard classification of St. Clair County Retention Pond 1 Dam?
St. Clair County Retention Pond 1 Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates St. Clair County Retention Pond 1 Dam?
St. Clair County Retention Pond 1 Dam is owned by ST. CLAIR COUNTY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was St. Clair County Retention Pond 1 Dam built?
St. Clair County Retention Pond 1 Dam was completed in 1999, making it 27 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 St. Clair County Retention Pond 1 Dam?
St. Clair County Retention Pond 1 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 St. Clair County Retention Pond 1 Dam?
St. Clair County Retention Pond 1 Dam has a dam height of 31 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 St. Clair County Retention Pond 1 Dam last inspected?
St. Clair County Retention Pond 1 Dam was last inspected on June 1, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.