Boundary
Dam in Pend Oreille County, Washington · Pend Oreille River · forms Boundary Lake
Height
360 ft
110 m (NID height)
Length
740 ft
226 m
Completed
1967
Boundary Lake today
1,972.16 ft
7 days ▼ 2.82 ft
Normal storage
95,000 acre-ft
Much below normal for the date
Reservoir level measured Oct 23, 2026, 12:00 AM PDT. Full level page →
Facts
- Purposes
- Hydroelectric; Recreation
- Dam type
- Concrete
- Structural height
- 360 ft
- Owner
- City of Seattle (Local Government)
- Maximum storage
- 95,000 acre-ft
- Surface area
- 1,668 acres
- Hydraulic height
- 330 ft
- Drainage area
- 25,200 sq mi
- Spillway
- Controlled
- Army Corps district
- Seattle District
- NID ID
- WA00009
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Aug 26, 2026. Search NID ID WA00009 at nid.sec.usace.army.mil. Project website.