Snohomish Sewage Lagoon
Key Takeaway
Snohomish Sewage Lagoon is classified as low hazard in Washington. It was completed in 1958 and is 68 years old. Its primary use is other.
Physical Details
| Dam Length | 5,000 ft |
| Dam Type | Earth |
| Max Storage | 400 acre-ft |
| Normal Storage | 120 acre-ft |
| Surface Area | 120 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 615 cfs |
| Year Completed | 1958 (68 years old) |
| NID ID | WA00539 |
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
Snohomish City
Local Government
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High HazardFrequently Asked Questions
What is the hazard classification of Snohomish Sewage Lagoon?
Snohomish Sewage Lagoon 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 Snohomish Sewage Lagoon?
Snohomish Sewage Lagoon is owned by Snohomish City (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Snohomish Sewage Lagoon built?
Snohomish Sewage Lagoon was completed in 1958, making it 68 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 Snohomish Sewage Lagoon?
Snohomish Sewage Lagoon serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Snohomish Sewage Lagoon last inspected?
Snohomish Sewage Lagoon was last inspected on June 12, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.