Roza Diversion
Key Takeaway
Roza Diversion is classified as low hazard in Washington. It was completed in 1939 and is 87 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 32 ft (taller than 38% in WA) |
| Dam Length | 486 ft |
| Dam Type | Concrete |
| Max Storage | 100 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 100 acres |
| Drainage Area | 1,785 sq mi |
| Max Discharge | 50,000 cfs |
| Year Completed | 1939 (87 years old) |
| NID ID | WA00275 |
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
RECLAMATION
Federal Government
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High HazardFrequently Asked Questions
What is the hazard classification of Roza Diversion?
Roza Diversion 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 Roza Diversion?
Roza Diversion is owned by RECLAMATION (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Roza Diversion built?
Roza Diversion was completed in 1939, making it 87 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 Roza Diversion?
Roza Diversion serves the following purposes: Hydroelectric, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Roza Diversion?
Roza Diversion has a dam height of 32 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 Roza Diversion last inspected?
Roza Diversion was last inspected on August 22, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.