Mill Creek Dam Cosmopolis
Key Takeaway
Mill Creek Dam Cosmopolis is classified as high hazard in Washington. It was completed in 2019 and is 7 years old. Its primary use is fish and wildlife pond. 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 Length | 200 ft |
| Dam Type | Gravity |
| Max Storage | 20 acre-ft |
| Normal Storage | 10 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 2019 (7 years old) |
| NID ID | WA01730 |
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
Cosmopolis City Public Works
Local Government
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High HazardFrequently Asked Questions
What is the hazard classification of Mill Creek Dam Cosmopolis?
Mill Creek Dam Cosmopolis 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 Mill Creek Dam Cosmopolis?
Mill Creek Dam Cosmopolis is owned by Cosmopolis City Public Works (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mill Creek Dam Cosmopolis built?
Mill Creek Dam Cosmopolis was completed in 2019, making it 7 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 Dam Cosmopolis?
Mill Creek Dam Cosmopolis serves the following purposes: Fish And Wildlife Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Mill Creek Dam Cosmopolis last inspected?
Mill Creek Dam Cosmopolis was last inspected on December 21, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.