Interstate Highways in Washington State

WSDOT maintains seven major interstates:

• I-5: North-south backbone, Canadian border (Blaine) to Oregon border (Ridgefield).
• I-90: East-west mainline, Idaho (Spokane) to Puget Sound.
• I-405: I-5 spur, Tukwila to Lynnwood.
• I-182: Short, Richland (I-90) to Hanford Site.
• I-205: I-5 bypass, Vancouver to Portland, OR.
• I-395: Short, Spokane (I-90) to Idaho border.
• I-512: I-5 spur, Federal Way to Tacoma.