Dewey
Key Takeaway
Dewey is classified as significant hazard in Idaho. It was completed in 1913 and is 113 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 30 ft (taller than 55.8% in ID) |
| Dam Length | 2,300 ft |
| Normal Storage | 225 acre-ft |
| Surface Area | 82 acres |
| Drainage Area | 99 sq mi |
| Max Discharge | 687 cfs |
| Year Completed | 1913 (113 years old) |
| NID ID | ID00033 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Dewey?
Dewey is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Dewey?
Dewey is owned by information not available (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Dewey built?
Dewey was completed in 1913, making it 113 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 Dewey?
Dewey 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 Dewey?
Dewey has a dam height of 30 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 Dewey last inspected?
Dewey was last inspected on July 28, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.