Interstate 405 is a short Interstate Highway in Portland, Oregon

Portland, Oregon

Portland is a city located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States...

. It forms a loop from Interstate 5

Interstate 5 in Oregon

In the U.S. state of Oregon, Interstate 5 traverses the state from north to south, passing through the major cities of Portland, Salem, Eugene, and Medford.-Route description:...

 that travels through downtown Portland west of the Willamette River

Willamette River

The Willamette River is a major tributary of the Columbia River, accounting for 12 to 15 percent of the Columbia's flow. The Willamette's main stem is long, lying entirely in northwestern Oregon in the United States...

.

Route description

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

Portland State University

Portland State University is a public state urban university located in downtown Portland, Oregon, United States. Founded in 1946, it has the largest overall enrollment of any university in the state of Oregon, including undergraduate and graduate students. It is also the only public university in...

, to an interchange with the U.S. Route 26

U.S. Route 26 in Oregon

In the U.S. state of Oregon, U.S. Route 26 is a major cross-state state highway, connecting U.S. Route 101 on the Oregon Coast near Seaside with the Idaho state line east of Nyssa. Local highway names include the Sunset Highway No. 47, Mount Hood Highway No. 26, and John Day Highway No...

 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

Downtown Portland

Downtown Portland, the city center of Portland, Oregon, United States, is located on the west bank of the Willamette River. It is in the northeastern corner of the southwest section of the city and is where most of the city's high-rise buildings are found....

. It runs mostly below grade through this area. At the north edge of downtown, as it approaches the Willamette River

Willamette River

The Willamette River is a major tributary of the Columbia River, accounting for 12 to 15 percent of the Columbia's flow. The Willamette's main stem is long, lying entirely in northwestern Oregon in the United States...

, 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

Fremont Bridge (Portland)

The Fremont Bridge is a steel tied arch bridge over the Willamette River located in Portland, Oregon. It carries Interstate 405 and US 30 traffic between downtown and North Portland where it intersects with I-5...

. At the northeastern end of the bridge is a partially completed stack interchange

Stack interchange

A stack interchange is a free-flowing grade separated junction between two roads.In countries where one drives on the right, left turns are handled by semi-directional flyover/under ramps...

 with Interstate 5; the canceled Rose City Freeway

Rose City Freeway

The Rose City Freeway was a proposed freeway alignment through the Northeast sector of Portland, Oregon. The freeway's path would have begun at the I-5/I-405 interchange near the Fremont Bridge's east approach. From the elevated stack interchange, it would transition to grade, moving roughly...

 was to be a continuation of I-405, serving Portland International Airport

Portland International Airport

Portland International Airport is a joint civil-military airport and the largest airport in the U.S. state of Oregon, accounting for 90% of passenger travel and more than 95% of air cargo of the state. It is located within Portland's city limits just south of the Columbia River in Multnomah...

 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

Legacy Emanuel Hospital & Health Center

Legacy Emanuel Medical Center is a medical facility located in Portland, Oregon, United States. Founded in 1912 by the Lutheran Church, it is a part of Legacy Health...

.

History

The earliest portion of Interstate 405 opened to traffic on February 25, 1969. The loop was completed in 1973 when the Fremont Bridge

Fremont Bridge (Portland)

The Fremont Bridge is a steel tied arch bridge over the Willamette River located in Portland, Oregon. It carries Interstate 405 and US 30 traffic between downtown and North Portland where it intersects with I-5...

 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.

Exit list

The entire route is in Portland

Portland, Oregon

Portland is a city located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States...

, Multnomah County

Multnomah County, Oregon

Multnomah County is one of 36 counties in the U.S. state of Oregon. Though smallest in area, it is the most populous as its county seat, Portland, is the state's largest city...

.

Mile	# Exit number An exit number is a number assigned to a road junction, usually an exit from a freeway. It is usually marked on the same sign as the destinations of the exit, as well as a sign in the gore....	Destinations	Notes
-0.04			Southbound exit and northbound entrance
0.52	1A	Naito Parkway – Japanese-American Historical Plaza	Northbound exit and southbound entrance
0.52		, Seattle	Southbound exit and northbound entrance
0.89	1B	4th Avenue	Northbound exit and southbound entrance
1.03	1C		South end of US 26 overlap
1.40	1D	12th Avenue	Northbound exit and southbound entrance
1.62	1D		North end of US 26 overlap
1.92	2A	Salmon Street – PGE Park PGE Park Jeld-Wen Field is an outdoor sports stadium located in Portland, Oregon, United States that is used primarily for soccer and American football...	Northbound exit and southbound entrance
2.20	2A	Burnside Street, Couch Street	Southbound exit and northbound entrance
2.35	2B	Everett Street
3.08	3	– Northwest Industrial Area, St. Helens	South end of US 30 overlap
3.78			North end of US 30 overlap; northbound exit and southbound entrance
4.18		Kerby Avenue	Northbound exit and southbound entrance
4.21		– Seattle	Northbound exit and southbound entrance

External links