Editing Interstate 5 (section)

===Oregon===
{{main|Interstate 5 in Oregon}}

I-5 enters Oregon near [[Siskiyou Summit]], which sits at {{convert|4310|ft|m}} and is the highest point on the highway.<ref>{{cite encyclopedia |last=LaLande |first=Jeff |date=March 17, 2018 |title=Siskiyou Pass |url=https://www.oregonencyclopedia.org/articles/siskiyou_pass/ |encyclopedia=[[The Oregon Encyclopedia]] |accessdate=December 16, 2021 |archive-date=December 16, 2021 |archive-url=https://web.archive.org/web/20211216080630/https://www.oregonencyclopedia.org/articles/siskiyou_pass/ |url-status=live }}</ref><ref>{{cite news |last=Fattig |first=Paul |date=October 30, 2012 |title=ODOT plans to use rock salt for I-5 ice melt |url=http://mailtribune.com/archive/odot-plans-to-use-rock-salt-for-i-5-ice-melt |work=[[Mail Tribune]] |url-status=dead |archive-url=https://web.archive.org/web/20200810193416/https://mailtribune.com/archive/odot-plans-to-use-rock-salt-for-i-5-ice-melt |archive-date=August 10, 2020 |accessdate=December 16, 2021}}</ref> From the summit, I-5 descends by {{convert|2,300|ft|m}} over {{convert|6|mi|km}} at a 6&nbsp;percent grade to reach the [[Rogue Valley]].<ref>{{cite web |date=September 2005 |title=Respect the Siskiyou Pass |url=https://www.oregon.gov/ODOT/MCT/Documents/siskiyoupass.pdf |publisher=Oregon Department of Transportation |accessdate=December 17, 2021 |archive-date=March 21, 2018 |archive-url=https://web.archive.org/web/20180321063232/http://www.oregon.gov/ODOT/MCT/Documents/siskiyoupass.pdf |url-status=live }}</ref> The freeway passes through [[Ashland, Oregon|Ashland]] and [[Medford, Oregon|Medford]], running parallel to [[Oregon Route 99]], and turns west to follow the [[Rogue River (Oregon)|Rogue River]] to [[Grants Pass, Oregon|Grants Pass]], where it intersects [[U.S. Route 199|US&nbsp;199]]. I-5 then turns north and crosses a series of passes in the [[Klamath Mountains]] to reach the Umpqua Valley, where it follows the [[South Umpqua River]] to [[Roseburg, Oregon|Roseburg]].<ref name="google"/><ref name="OR-Map">{{cite map |date=April 2019 |title=Oregon 2019–2021 Official State Map |url=https://www.oregon.gov/odot/Data/Documents/Map_Official_State_Front.pdf |inset= Portland and Vicinity|publisher=Oregon Department of Transportation |accessdate=December 17, 2021 |archive-date=July 17, 2020 |archive-url=https://web.archive.org/web/20200717135748/https://www.oregon.gov/odot/Data/Documents/Map_Official_State_Front.pdf |url-status=live }}</ref>

The highway enters the [[Willamette Valley]] near [[Cottage Grove, Oregon|Cottage Grove]] and forms the boundary between the cities of [[Eugene, Oregon|Eugene]] and [[Springfield, Oregon|Springfield]]. After crossing the [[Willamette River]], I-5 intersects [[Oregon Route 126]], which carries [[Interstate 105 (Oregon)|I-105]], and [[Oregon Route 569]]; both highways provide connections to Eugene and Springfield. I-5 then travels due north through farmland on the east side of the Willamette River, passing a junction with [[U.S. Route 20|US&nbsp;20]] in [[Albany, Oregon|Albany]], and bisects eastern [[Salem, Oregon|Salem]] near the [[Oregon State Capitol|state capitol campus]].<ref name="OR-Map"/> It is connected to downtown Salem by [[Oregon Route 22]] and the [[Oregon Route 99E Business|Salem Parkway]], which joins I-5 as the freeway crosses the [[45th parallel north|45th&nbsp;parallel]] near [[Keizer, Oregon|Keizer]].<ref name="google"/><ref>{{cite news |last=Brown |first=K. Williams |date=July 10, 2011 |title=The beauty of halfwayism |page=5D |work=[[Statesman Journal]] |url=https://www.newspapers.com/clip/21727397/cities-on-the-45th-parallel-n/ |via=Newspapers.com |accessdate=December 16, 2021 |archive-date=December 17, 2021 |archive-url=https://web.archive.org/web/20211217081406/https://www.newspapers.com/clip/21727397/cities-on-the-45th-parallel-n/ |url-status=live }}</ref>

From Salem, I-5 turns northeast and passes [[Woodburn, Oregon|Woodburn]] before crossing the Willamette River on the [[Boone Bridge (Oregon)|Boone Bridge]] in [[Wilsonville, Oregon|Wilsonville]], at the south end of the [[Portland metropolitan area, Oregon|Portland metropolitan area]]. The freeway travels through the southern suburbs of [[Portland, Oregon|Portland]], intersecting [[Interstate 205 (Oregon–Washington)|I-205]] in [[Tualatin, Oregon|Tualatin]] and [[Oregon Route 217]] in [[Tigard, Oregon|Tigard]] before entering the city proper. I-5 then turns northeast to follow [[Barbur Boulevard]] (part of Route&nbsp;99W) and navigate the [[Terwilliger curves]]. The freeway continues north through the [[South Waterfront, Portland, Oregon|South Waterfront]] neighborhood, crossing under the [[Portland Aerial Tram]] and the western approach to the [[Ross Island Bridge]] (carrying [[U.S. Route 26|US&nbsp;26]]) before reaching an interchange with [[Interstate 405 (Oregon)|I-405]].<ref name="google"/><ref name="OR-Map"/>

I-5 and I-405 form a complete loop around [[downtown Portland]], with I-5 crossing the Willamette River on the [[Marquam Bridge]] to run along the eastern riverfront. The freeway has interchanges with several major bridges crossing the Willamette, as well as the western terminus of [[Interstate 84 (Oregon–Utah)|I-84]] near the [[Oregon Convention Center]]. From the I-84 interchange to a second junction with I-405 near the [[Fremont Bridge (Portland, Oregon)|Fremont Bridge]], I-5 is concurrent with [[U.S. Route 30|US&nbsp;30]], which continues west towards [[Astoria, Oregon|Astoria]].<ref name="OR-Map"/> Through [[North Portland, Oregon|North Portland]], the freeway runs below street level until it crosses the [[Columbia Slough]] to bisect [[Delta Park]]. {{nowrap|I-5}} continues across [[Hayden Island, Portland, Oregon|Hayden Island]] to the [[Interstate Bridge]], a pair of [[vertical-lift bridge]]s which carry the highway over the [[Columbia River]] into Washington state.<ref name="google"/><ref>{{cite news |last=Macuk |first=Anthony |date=September 19, 2021 |title=Keeping the Interstate 5 Bridge up and running |url=https://www.columbian.com/news/2021/sep/19/keeping-the-interstate-5-bridge-up-and-running/ |work=[[The Columbian]] |accessdate=December 17, 2021 |archive-date=December 17, 2021 |archive-url=https://web.archive.org/web/20211217081417/https://www.columbian.com/news/2021/sep/19/keeping-the-interstate-5-bridge-up-and-running/ |url-status=live }}</ref>