Interstate 405 (Oregon)

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Interstate 405 marker

Interstate 405
Route information
Maintained by ODOT
Length: 4.25 mi[1] (6.84 km)
Existed: 1950s – present
Major junctions
South end: I-5 in Portland
  US 26 in Portland
US 30 in Portland
North end: I-5 / US 30 in Portland
Highway system
OR 402 OR 410

Interstate 405 (I-405, also known as the Stadium Freeway No. 61[2]) is a short Interstate Highway in Portland, Oregon. It forms a loop from Interstate 5 that travels through downtown Portland west of the Willamette River.

Route description[edit]

Interstate 405's southern terminus is at a complex Y-like stack interchange with Interstate 5 and Harbor Dr. (formerly Harbor Freeway) in the South Portland neighborhood, near the southern edge of downtown. The highway travels northwest for about a mile, passing the campus of Portland State University, to an interchange with the U.S. Route 26 freeway bound for the western suburbs of Portland. I-405 then travels north for just over a mile, forming the western edge of Downtown Portland. It runs mostly below grade through this area. At the north edge of downtown, as it approaches the Willamette River, I-405 reaches a Y interchange with U.S. Route 30. This interchange and the short freeway portion of U.S. 30 to which it connects were originally intended for the canceled I-505.

I-405 and U.S. 30 share alignment as they cross the Willamette River on the double-decker Fremont Bridge. At the northeastern end of the bridge is a partially completed stack interchange with Interstate 5; the canceled Rose City Freeway was to be a continuation of I-405, serving Portland International Airport and northeast Portland. Only a small stub portion of the Rose City Freeway was built, in order to provide a connection between the bridge and nearby Legacy Emanuel Hospital.


The earliest portion of Interstate 405 opened to traffic on February 25, 1969. The loop was completed in 1973 when the Fremont Bridge opened, linking I-405 to I-5 in North Portland. In August 2009 the entire route with the exception of the Fremont bridge was completely repaved for the first time after it opened to traffic. The bridge itself was repaved in August 2011.

In 1998, Mayor Vera Katz proposed capping a portion of the freeway in Downtown Portland with buildings and parks.[3]

Exit list[edit]

The view southward from the NW Everett Street overpass.
Approaching the southern terminus from the Marquam Bridge.

The entire route is in Portland, Multnomah County.

mi[1] km Exit Destinations Notes
−0.04 −0.064 I-5 south – Salem Southern terminus; southbound exit, no northbound entrance; I-5 north exit 299B; south no number signed
0.52 0.84 1A South Waterfront – City Center Northbound exit, no southbound entrance
0.52 0.84 I-5 north to I-84 east – The Dalles, Seattle Southbound exit, no northbound entrance
0.89 1.43 1B 4th Avenue Northbound exit, no southbound entrance
1.03 1.66 1C US 26 east / 6th Avenue – Ross Island Bridge Southern end of US 26 concurrency
1.40 2.25 1D 12th Avenue Northbound exit, no southbound entrance
1.62 2.61 1D US 26 west – Beaverton Northern end of US 26 concurrency
1.92 3.09 2A Salmon Street – Providence Park Northbound exit, no southbound entrance
2.20 3.54 2A Burnside Street, Couch Street Southbound exit, no northbound entrance
2.35 3.78 2B Everett Street
3.08 4.96 3 US 30 west – Northwest Industrial Area, St. Helens Southern end of US 30 concurrency
3.78 6.08 US 30 east (I-5 south) – The Dalles Northern end of US 30 concurrency; northbound exit, no southbound entrance
4.18 6.73 Kerby Avenue Northbound exit, no southbound entrance
4.21 6.78 I-5 north – Seattle Northern terminus; northbound exit, no southbound entrance; I-5 exit 302B
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Oregon Department of Transportation, Public Road Inventory Archived 2008-02-24 at the Wayback Machine. (primarily the Digital Video Log), accessed April 2008
  2. ^ "Trans Dev - Transportation Data Routes | State Highway Cross Reference". Oregon Department of Transportation. 4 February 2007. Retrieved 21 February 2010. 
  3. ^ Mehlhaf, Nina (February 25, 2015). "Grassroots support for building I-405 freeway cap". KGW. Retrieved 16 August 2015. 

External links[edit]

Route map: Google

KML is from Wikidata

Media related to Interstate 405 (Oregon) at Wikimedia Commons