Cottage Grove Dam
Key Takeaway
Cottage Grove Dam is classified as high hazard in Oregon. It was completed in 1942 and is 84 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 | 81 ft (taller than 92.2% in OR) |
| Dam Length | 2,110 ft |
| Dam Type | Earth |
| Max Storage | 50.0K acre-ft |
| Normal Storage | 33.0K acre-ft |
| Surface Area | 1,158 acres |
| Drainage Area | 104 sq mi |
| Max Discharge | 40,800 cfs |
| Year Completed | 1942 (84 years old) |
| NID ID | OR00005 |
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
USACE - Portland District
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Cottage Grove Dam?
Cottage Grove Dam 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 Cottage Grove Dam?
Cottage Grove Dam is owned by USACE - Portland District (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Cottage Grove Dam built?
Cottage Grove Dam was completed in 1942, making it 84 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 Cottage Grove Dam?
Cottage Grove Dam serves the following purposes: Flood Risk Reduction, Other, Irrigation, Navigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Cottage Grove Dam?
Cottage Grove Dam has a dam height of 81 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 Cottage Grove Dam last inspected?
Cottage Grove Dam was last inspected on April 19, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.