Title: Interstate 405 (Washington) - Wikipedia
Headings: Interstate 405 (Washington)
Interstate 405 (Washington)
Contents
Route description
Tukwila to Bellevue
Bellevue to Lynnwood
History
Corridor program
Transit service
Exit list
References
External links

Content: Interstate 405 (Washington) - Wikipedia
Interstate 405 (Washington)
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This article is about the highway in Washington. For the highway in California, see Interstate 405 (California). For other uses, see Interstate 405. Interstate highway bypassing Seattle, Washington
Interstate 405
I-405 highlighted in red
Route information
Auxiliary route of I-5
Defined by RCW 47.17.595
Maintained by WSDOT
Length
30.30 mi (48.76 km)
Existed
1957–present
Major junctions
South end
I-5 / SR 518 in Tukwila

SR 167 in Renton
I-90 in Bellevue
SR 520 in Bellevue
SR 522 in Bothell
North end
I-5 / SR 525 in Lynnwood
Location
Counties
King, Snohomish

Highway system
Interstate Highway System
Main
Auxiliary
Suffixed
Business
Future
State highways in Washington
Interstate
US
State
Scenic
Former PSH
1964 renumbering
Former
← SR 401

→ SR 409
Interstate 405 ( I-405) is a north–south auxiliary Interstate Highway serving the Seattle region of Washington, United States. It bypasses Seattle east of Lake Washington, traveling through the Eastside area of King and Snohomish counties, providing an alternate route to I-5. The 30-mile (48 km) freeway serves the cities of Renton, Bellevue, Kirkland, and Bothell. I-405 terminates at I-5 in Tukwila and Lynnwood, and also intersects several major highways, including SR 167, I-90, SR 520, and SR 522 . The Eastside highway was originally built in the early 20th century to connect cities along the lake and was formally added to the state highway system in 1937 as Secondary State Highway 2A (SSH 2A). A freeway replacement for SSH 2A was proposed in the 1940s by the state government and designated as I-405 as part of the federal Interstate Highway program, with the first section beginning construction in 1956 and completed in 1965. It was initially signed as SR 405 until the freeway was fully completed in 1971;