Conconully
Key Takeaway
Conconully is classified as high hazard in Washington. It was completed in 1909 and is 117 years old. Its primary use is irrigation. 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 | 72 ft (taller than 56.5% in WA) |
| Dam Length | 1,075 ft |
| Dam Type | Earth |
| Max Storage | 16.6K acre-ft |
| Normal Storage | 13.0K acre-ft |
| Surface Area | 450 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 11,580 cfs |
| Year Completed | 1909 (117 years old) |
| NID ID | WA00259 |
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 Conconully?
Conconully 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 Conconully?
Conconully is owned by RECLAMATION (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Conconully built?
Conconully was completed in 1909, making it 117 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 Conconully?
Conconully serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Conconully?
Conconully has a dam height of 72 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 Conconully last inspected?
Conconully was last inspected on July 30, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.