Mill Creek Structure 1 Dam
Key Takeaway
Mill Creek Structure 1 Dam is classified as significant hazard in Illinois. It was completed in 1980 and is 46 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 | 81 ft (taller than 98.4% in IL) |
| Dam Length | 1,470 ft |
| Dam Type | Earth |
| Max Storage | 40.3K acre-ft |
| Normal Storage | 17.5K acre-ft |
| Surface Area | 811 acres |
| Drainage Area | 21 sq mi |
| Max Discharge | 39,280 cfs |
| Year Completed | 1980 (46 years old) |
| NID ID | IL01233 |
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
CLARK COUNTY PARK DISTRICT
Private
Nearby Dams
Mill Creek Strcture 2 Dam
Clark, IL
Low Hazard 38 ftLashbrook Pond Dam
Clark, IL
Low Hazard 40 ftBass Lake Dam
Clark, IL
Low Hazard 33 ftMill Creek Structure 3 Dam
Clark, IL
Significant Hazard 38 ftMill Creek WS Str 4
Clark, IL
Low Hazard 35 ftMartin Tarbel Lake Dam
Clark, IL
Low Hazard 23 ftMill Creek Structure 6 Dam
Clark, IL
Low Hazard 34 ftNewmans Lake Dam
Clark, IL
Low Hazard 24 ftFrequently Asked Questions
What is the hazard classification of Mill Creek Structure 1 Dam?
Mill Creek Structure 1 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 Mill Creek Structure 1 Dam?
Mill Creek Structure 1 Dam is owned by CLARK COUNTY PARK DISTRICT (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mill Creek Structure 1 Dam built?
Mill Creek Structure 1 Dam was completed in 1980, making it 46 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 Mill Creek Structure 1 Dam?
Mill Creek Structure 1 Dam serves the following purposes: Flood Risk Reduction, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Mill Creek Structure 1 Dam?
Mill Creek Structure 1 Dam has a dam height of 81 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 Mill Creek Structure 1 Dam last inspected?
Mill Creek Structure 1 Dam was last inspected on June 14, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.