Zylstra Dam No 2
Key Takeaway
Zylstra Dam No 2 is classified as low hazard in Washington. It was completed in 1963 and is 63 years old. Its primary use is irrigation.
Physical Details
| Dam Type | Earth |
| Max Storage | 430 acre-ft |
| Normal Storage | 280 acre-ft |
| Surface Area | 280 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 117 cfs |
| Year Completed | 1963 (63 years old) |
| NID ID | WA00163 |
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
San Juan County Land Bank
Local Government
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Low HazardFrequently Asked Questions
What is the hazard classification of Zylstra Dam No 2?
Zylstra Dam No 2 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 Zylstra Dam No 2?
Zylstra Dam No 2 is owned by San Juan County Land Bank (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Zylstra Dam No 2 built?
Zylstra Dam No 2 was completed in 1963, making it 63 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 Zylstra Dam No 2?
Zylstra Dam No 2 serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Zylstra Dam No 2 last inspected?
Zylstra Dam No 2 was last inspected on November 7, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.