Interstate 605 (Washington)

Interstate 605 (I-605) is the popular moniker given to several proposals for a new auxiliary Interstate Highway bypassing I-5 and I-405 in the U.S. state of Washington. Proposals have been heard from since the 1960s, including highways connecting from I-5 all the way to the Canada–US border, and some just between I-5 and I-90. The Washington State Department of Transportation (WSDOT) has no projects designated I-605 at this time. However, some I-605 proposals have included State Route 18, which has been partially constructed as a freeway.

Interstate 605

Proposed 1998 corridor of I-605 highlighted in red
Route information
Auxiliary route of I-5
StatusNever built
NHSEntire route
Location
CountryUnited States
StateWashington
Highway system
  • Main
  • Auxiliary
  • Suffixed
  • Business
  • Future
  • State highways in Washington
SR 603 SR 702
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