Boundary
Pend Oreille River·
Pend Oreille, Washington·
Built 1967·
Concrete·
340 ft tall
Physical Details
| Dam Height | 340 ft (taller than 93.5% in WA) |
| Dam Length | 740 ft |
| Dam Type | Concrete |
| Max Storage | 95.0K acre-ft |
| Normal Storage | 95.0K acre-ft |
| Surface Area | 1,668 acres |
| Drainage Area | 25,200 sq mi |
| Max Discharge | 360,000 cfs |
| Year Completed | 1967 (59 years old) |
| NID ID | WA00009 |
Safety Information
High Hazard
Loss of human life is likely if the dam fails
Emergency Action Plan: Yes
Last Inspection: May 24, 2022
State Regulated: No
Ownership
City of Seattle
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Boundary?
Boundary is classified as High Hazard. Loss of human life is likely if the dam fails.
Who owns Boundary?
Boundary is owned by City of Seattle (Local Government).
When was Boundary last inspected?
Boundary was last inspected on May 24, 2022.
When was Boundary built?
Boundary was completed in 1967, making it 59 years old.
Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.