Cottonwood (Drewsey)
Key Takeaway
Cottonwood (Drewsey) is classified as significant hazard in Oregon. It was completed in 1967 and is 59 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 73 ft (taller than 91.2% in OR) |
| Dam Length | 335 ft |
| Dam Type | Other |
| Max Storage | 4.5K acre-ft |
| Normal Storage | 3.7K acre-ft |
| Surface Area | 112 acres |
| Drainage Area | 34 sq mi |
| Max Discharge | 1,450 cfs |
| Year Completed | 1967 (59 years old) |
| NID ID | OR00435 |
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
OTIS VALLEY IRRIGATION
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Cottonwood (Drewsey)?
Cottonwood (Drewsey) 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 Cottonwood (Drewsey)?
Cottonwood (Drewsey) is owned by OTIS VALLEY IRRIGATION (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Cottonwood (Drewsey) built?
Cottonwood (Drewsey) was completed in 1967, making it 59 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 Cottonwood (Drewsey)?
Cottonwood (Drewsey) 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 Cottonwood (Drewsey)?
Cottonwood (Drewsey) has a dam height of 73 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 Cottonwood (Drewsey) last inspected?
Cottonwood (Drewsey) was last inspected on November 17, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.