Tieton
Key Takeaway
Tieton is classified as high hazard in Washington. It was completed in 1925 and is 101 years old. Its primary use is flood risk reduction. 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 Height | 196 ft (taller than 78.3% in WA) |
| Dam Length | 920 ft |
| Dam Type | Concrete |
| Max Storage | 203.6K acre-ft |
| Normal Storage | 198.0K acre-ft |
| Surface Area | 2,525 acres |
| Drainage Area | 119,000 sq mi |
| Max Discharge | 45,700 cfs |
| Year Completed | 1925 (101 years old) |
| NID ID | WA00273 |
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
RECLAMATION
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Tieton?
Tieton 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 Tieton?
Tieton is owned by RECLAMATION (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Tieton built?
Tieton was completed in 1925, making it 101 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 Tieton?
Tieton serves the following purposes: Flood Risk Reduction, Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Tieton?
Tieton has a dam height of 196 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 Tieton last inspected?
Tieton was last inspected on August 27, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.