Tapps Lake Dike No 4
Key Takeaway
Tapps Lake Dike No 4 is classified as high hazard in Washington. It was completed in 1911 and is 115 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 Length | 2,870 ft |
| Dam Type | Earth |
| Max Storage | 53.6K acre-ft |
| Normal Storage | 46.7K acre-ft |
| Surface Area | 2,570 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1911 (115 years old) |
| NID ID | WA00296 |
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
Cascade Water Alliance
Public Utility
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High HazardFrequently Asked Questions
What is the hazard classification of Tapps Lake Dike No 4?
Tapps Lake Dike No 4 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 Tapps Lake Dike No 4?
Tapps Lake Dike No 4 is owned by Cascade Water Alliance (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Tapps Lake Dike No 4 built?
Tapps Lake Dike No 4 was completed in 1911, making it 115 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 Tapps Lake Dike No 4?
Tapps Lake Dike No 4 serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Tapps Lake Dike No 4 last inspected?
Tapps Lake Dike No 4 was last inspected on July 12, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.