# Interstate 90
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> Markdown URL: https://mediated.wiki/source/Interstate_90.md
> Source: https://en.wikipedia.org/wiki/Interstate_90
> Source revision: 1356638724
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)
{{Short description|Interstate Highway across northern United States}}
{{Use American English|date=April 2025}}
{{Featured article}}
{{Use mdy dates|date=October 2017}}
{{Infobox road
|country=USA
|type=I
|route=90
|map={{maplink-road|from=Interstate 90.map}}
|map_custom=yes
|map_notes=I-90 highlighted in red
|map_alt=A map of the contiguous United States showing the route of Interstate 90 as it travels from west to east through the northern states.
|length_mi=3099.74
|length_ref=[{{cite web |date=January 26, 2022 |title=Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021 |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table01.cfm |work=Route Log and Finder List |publisher=[Federal Highway Administration](/source/Federal_Highway_Administration) |access-date=February 10, 2022 |archive-date=April 22, 2012 |archive-url=https://web.archive.org/web/20120422220808/http://www.fhwa.dot.gov/reports/routefinder/table1.cfm |url-status=live }}][
|established={{start date|1957|08|14}}][{{cite book |author= Southwest Region Staff |title= State Trunk Highway Log for Southwest Region |date= December 31, 2008 |publisher= Wisconsin Department of Transportation |location=Madison, WI |type= XLS |at= 090E}}]
|mi|km|disp=table}}
|-
|[{{abbr|IL|Illinois}}](/source/Interstate_90_in_Illinois)
|{{convert|123.89|mi|km|disp=table}}
|-
|[{{abbr|IN|Indiana}}](/source/Interstate_90_in_Indiana)
|{{convert|156.28|mi|km|disp=table}}
|-
|[{{abbr|OH|Ohio}}](/source/Interstate_90_in_Ohio)
|{{convert|244.75|mi|km|disp=table}}
|-
|[{{abbr|PA|Pennsylvania}}](/source/Interstate_90_in_Pennsylvania)
|{{convert|46.30|mi|km|disp=table}}
|-
|[{{abbr|NY|New York}}](/source/Interstate_90_in_New_York)
|{{convert|385.48|mi|km|disp=table}}
|-
|[{{abbr|MA|Massachusetts}}](/source/Interstate_90_in_Massachusetts)
|{{convert|135.72|mi|km|disp=table}}
|-
|Total
|{{convert|3,099.74|mi|km|disp=table}}
|}
I-90 is the longest [Interstate Highway](/source/Interstate_Highway) in the United States, spanning {{convert|3,099.74|mi|km}} across the northern portion of the coterminous part of the country.[{{cite web |year=2010 |title=Eisenhower Interstate Highway System, Previous Facts of the Day |url=https://highways.dot.gov/highway-history/interstate-system/50th-anniversary |publisher=Federal Highway Administration |access-date=November 28, 2021 |archive-date=August 8, 2020 |archive-url=https://web.archive.org/web/20200808130349/https://www.fhwa.dot.gov/interstate/previousfacts.cfm |url-status=live }}][{{google maps |title=Overview of Interstate 90 |url=https://www.google.com/maps/dir/47.5902689,-122.3290545/43.7992152,-99.3498824/41.8495308,-87.644372/42.6648806,-73.7289984/42.3776024,-71.0270117/@44.1147106,-105.6436969,3287233m/am=t/data=!3m2!1e3!4b1!4m13!4m12!1m5!3m4!1m2!1d-106.6246939!2d44.3328471!3s0x5335770ccdea65cf:0xc100e85f0a55d267!1m0!1m0!1m0!1m0!3e0!4e1 |accessdate=November 29, 2021}}] From the [Wisconsin](/source/Wisconsin)–[Illinois](/source/Illinois) state line to [Massachusetts](/source/Massachusetts), approximately {{convert|760|mi|km}} of I-90 uses [turnpikes](/source/toll_road) and other tolled highways with the exception of segments in [Chicago](/source/Chicago), northeastern Ohio, [Pennsylvania](/source/Pennsylvania), and [Albany](/source/Albany%2C_New_York), New York. The toll road sections comprise 25 percent of the freeway's total length.[{{cite web |author=((FHWA Office of Transportation Policy Studies)) |date=September 2009 |title=Longer Combination Vehicles on Exclusive Truck Lanes: Interstate 90 Corridor Case Study |url=https://www.fhwa.dot.gov/policy/otps/110721/sec1.cfm |publisher=Federal Highway Administration |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232848/https://www.fhwa.dot.gov/policy/otps/110721/sec1.cfm |url-status=live }}]
According to 2011 data from the [Federal Highway Administration](/source/Federal_Highway_Administration), the busiest section of I-90 is in the Chicago area, where a [daily average](/source/Annual_average_daily_traffic) of 306,574 vehicles use the freeway. The lowest daily traffic counts on I-90 were recorded in Wyoming, where an average of 9,820 vehicles used rural sections of the freeway.[{{cite web |author=((FHWA Office of Highway Policy Information)) |date=August 2013 |title=2011 Interstate Brief: Summary of the Interstate System by State and Route Number |pages=4, 15 |url=https://www.fhwa.dot.gov/interstatebrief2011/2011interstatebrief.pdf |publisher=Federal Highway Administration |accessdate=April 3, 2022 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232847/https://www.fhwa.dot.gov/interstatebrief2011/2011interstatebrief.pdf |url-status=live }}]
===Washington===
{{Main|Interstate 90 in Washington}}
[[File:I-90 as seen from Mount Si.jpg|thumb|right|Aerial view of I-90 near [North Bend, Washington](/source/North_Bend%2C_Washington)|alt=Aerial view of a divided highway making two turns in a densely forested area.]]
The western terminus of I-90 is at an intersection with [Washington State Route 519](/source/Washington_State_Route_519) and 4th Avenue South in the [SoDo](/source/Sodo%2C_Seattle) neighborhood of [Seattle](/source/Seattle). The junction is south of [Downtown Seattle](/source/Downtown_Seattle), adjacent to the [Port of Seattle](/source/Port_of_Seattle) and two major sports stadiums, [Lumen Field](/source/Lumen_Field) and [T-Mobile Park](/source/T-Mobile_Park).[{{cite news |last=Lindblom |first=Mike |date=August 6, 2008 |title=Port clears way for I-90 link to waterfront |page=B2 |url=http://old.seattletimes.com/html/localnews/2008094653_sodo06m.html |work=[The Seattle Times](/source/The_Seattle_Times) |url-status=dead |archive-url=https://web.archive.org/web/20180616130827/http://old.seattletimes.com/html/localnews/2008094653_sodo06m.html |archive-date=June 16, 2018 |accessdate=November 28, 2021}}] The freeway travels east through an interchange with [I-5](/source/Interstate_5) and around [Beacon Hill](/source/Beacon_Hill%2C_Seattle) before it enters the [Mount Baker Ridge Tunnel](/source/Mount_Baker_Ridge_Tunnel) alongside the [2 Line](/source/2_Line_(Sound_Transit)) of the [Link light rail](/source/Link_light_rail) system.[{{cite news |last=Lee |first=Jessica |date=May 11, 2017 |title=From the archives: A look back at the I-90 floating bridges before light-rail work begins |url=https://www.seattletimes.com/seattle-news/transportation/from-the-archives-a-look-back-on-i-90-floating-bridges-before-light-rail-work-begins/ |work=The Seattle Times |accessdate=November 28, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129064619/https://www.seattletimes.com/seattle-news/transportation/from-the-archives-a-look-back-on-i-90-floating-bridges-before-light-rail-work-begins/ |url-status=live }}][{{cite news |last1=Deshais |first1=Nicholas |last2=Lindblom |first2=Mike |last3=Kroman |first3=David |date=March 28, 2026 |title=Seattle light rail finally opens across Lake Washington |url=https://www.seattletimes.com/seattle-news/transportation/seattle-light-rail-finally-opens-across-lake-washington/ |work=The Seattle Times |accessdate=March 30, 2026}}] I-90 emerges from the tunnel on a pair of [floating bridge](/source/pontoon_bridge)s, among the longest of their kind: the eastbound-only [Lacey V. Murrow Memorial Bridge](/source/Lacey_V._Murrow_Memorial_Bridge) and the [Homer M. Hadley Memorial Bridge](/source/Homer_M._Hadley_Memorial_Bridge), which carries westbound traffic and the light rail tracks.[{{cite WSDOT map |year=2014 |link=yes |accessdate=November 28, 2021}}]
The floating bridges cross [Lake Washington](/source/Lake_Washington) to [Mercer Island](/source/Mercer_Island%2C_Washington), where I-90 travels through a series of tunnels under {{convert|14|acre|ha}} of parkland, including [Aubrey Davis Park](/source/Aubrey_Davis_Park).[{{cite news |last=Reynolds |first=Peggy |date=September 9, 1993 |title=Last link of I-90 ends 30-year saga |page=A10 |url=https://archive.seattletimes.com/archive/?date=19930909&slug=1720198 |work=The Seattle Times |access-date=November 28, 2021 |archive-date=October 5, 2021 |archive-url=https://web.archive.org/web/20211005014301/https://archive.seattletimes.com/archive/?date=19930909&slug=1720198 |url-status=live }}][{{cite news |last=Johnston |first=Steve |date=September 9, 1993 |title=Hey Johnston: What's that big concrete thing floating on Lake Washington? |page=1 |url=https://archive.seattletimes.com/archive/?date=19930909&slug=1720153 |work=The Seattle Times |access-date=November 28, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232848/https://archive.seattletimes.com/archive/?date=19930909&slug=1720153 |url-status=live }}] The freeway continues from the island and enters [Bellevue](/source/Bellevue%2C_Washington), the largest city of the [Eastside](/source/Eastside_(King_County%2C_Washington)) region, and intersects [I-405](/source/Interstate_405_(Washington)) near [Factoria](/source/Factoria%2C_Bellevue). I-90 then travels along [Lake Sammamish](/source/Lake_Sammamish) and through [Issaquah](/source/Issaquah%2C_Washington) as it leaves the Seattle metropolitan area and ascends into the [Cascade Range](/source/Cascade_Range) on the [Mountains to Sound Greenway](/source/Mountains_to_Sound_Greenway), a designated [National Heritage Area](/source/National_Heritage_Area) and [National Scenic Byway](/source/National_Scenic_Byway).[{{cite web |title=Mountains to Sound Greenway National Heritage Area |url=https://www.nps.gov/places/mountains-to-sound-greenway-national-heritage-area.htm |publisher=[National Park Service](/source/National_Park_Service) |accessdate=November 28, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129064619/https://www.nps.gov/places/mountains-to-sound-greenway-national-heritage-area.htm |url-status=live }}] The freeway crosses [Snoqualmie Pass](/source/Snoqualmie_Pass), elevation {{convert|3,022|ft|m}}, at the crest of the mountain range near a [ski resort](/source/The_Summit_at_Snoqualmie).[{{cite news |last=Hill |first=Craig |date=January 10, 2014 |title=Snoqualmie opening benefits all |page=A1 |work=[The News Tribune](/source/The_News_Tribune) |url=https://www.newspapers.com/clip/89735243/snoqualmie-opening-benefits-all/ |via=[Newspapers.com](/source/Newspapers.com) |accessdate=November 28, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129064620/https://www.newspapers.com/clip/89735243/snoqualmie-opening-benefits-all/ |url-status=live }}]
From Snoqualmie Pass, I-90 follows the [Yakima River](/source/Yakima_River) into the [Kittitas Valley](/source/Kittitas_Valley) and intersects [I-82](/source/Interstate_82) in [Ellensburg](/source/Ellensburg%2C_Washington) after a brief [concurrency](/source/concurrency_(road)) with [U.S. Route 97](/source/U.S._Route_97) (US 97). The highway crosses the [Columbia River](/source/Columbia_River) on the [Vantage Bridge](/source/Vantage_Bridge) and turns northeast to climb the cliffs of the [Columbia Plateau](/source/Columbia_Plateau) near [George](/source/George%2C_Washington). After traveling east across [Moses Lake](/source/Moses_Lake%2C_Washington) and the surrounding agricultural region, I-90 begins a long concurrency with [US 395](/source/U.S._Route_395) at [Ritzville](/source/Ritzville%2C_Washington) as the highways turn northeast towards [Spokane](/source/Spokane%2C_Washington). I-90/US 395 is joined by [US 2](/source/U.S._Route_2) through western Spokane, where it intersects [US 195](/source/U.S._Route_195). The freeway crosses downtown Spokane on an elevated viaduct and splits from US 2 and US 395 to continue east across [Spokane Valley](/source/Spokane_Valley%2C_Washington) towards the Idaho state line.[{{cite news |last=Titone |first=Julie |date=August 25, 1996 |title=Highway 95: From top to bottom, we explore Idaho's famed roadway |page=E1 |url=https://www.spokesman.com/stories/1996/aug/25/highway-95-from-top-to-bottom-we-explore-idahos/ |work=[The Spokesman-Review](/source/The_Spokesman-Review) |accessdate=November 29, 2021 |archive-date=September 14, 2023 |archive-url=https://web.archive.org/web/20230914044803/https://www.spokesman.com/stories/1996/aug/25/highway-95-from-top-to-bottom-we-explore-idahos/ |url-status=live }}] I-90 then turns southeast to bypass Coeur d'Alene and travel along a series of ridges that face [Lake Coeur d'Alene](/source/Lake_Coeur_d'Alene), crossing an arm of the lake on the [Veterans Memorial Centennial Bridge](/source/Veterans_Memorial_Centennial_Bridge).[{{cite news |date=February 10, 2017 |title=Bennett Bay Bridge offers best of form and function |url=https://apps.itd.idaho.gov/Apps/MediaManagerMVC/transporter/2017/021017_Trans/021017_VaultBennettBayBr.html |work=The Transporter |publisher=[Idaho Transportation Department](/source/Idaho_Transportation_Department) |accessdate=November 30, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232854/https://apps.itd.idaho.gov/Apps/MediaManagerMVC/transporter/2017/021017_Trans/021017_VaultBennettBayBr.html |url-status=live }}]
The freeway continues east across [Fourth of July Summit](/source/Fourth_of_July_Summit) and descends into the Silver Valley, where it follows the [Coeur d'Alene River](/source/Coeur_d'Alene_River) through several small towns along the historic [Mullan Road](/source/Mullan_Road). I-90 serves the cities of [Kellogg](/source/Kellogg%2C_Idaho) and [Wallace](/source/Wallace%2C_Idaho) before it ascends into the [Bitterroot Range](/source/Bitterroot_Range) and crosses [Lookout Pass](/source/Lookout_Pass), which also marks the Montana state line.[{{cite map |year=2021 |title=Montana Official Highway Map |url=https://mdt.mt.gov/travinfo/docs/2021-mt-highway-map.pdf |location=Helena |publisher=[Montana Department of Transportation](/source/Montana_Department_of_Transportation) |scale=Scale not given |accessdate=November 29, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201004352/https://mdt.mt.gov/travinfo/docs/2021-mt-highway-map.pdf |url-status=live }}] It descends from Lookout Pass along the [St. Regis](/source/St._Regis_River_(Montana)) and [Clark Fork](/source/Clark_Fork_River) rivers between the foothills of the Bitteroot Range and [Coeur d'Alene Mountains](/source/Coeur_d'Alene_Mountains). The freeway travels east through the [Alberton Gorge](/source/Alberton%2C_Montana) and crosses the Clark Fork River several times before it reaches the head of the [Missoula Valley](/source/Missoula_Valley).[{{cite news |last=Gadbow |first=Daryl |date=July 22, 2004 |title=Gorgeous Gorge |page=C1 |work=[The Missoulian](/source/The_Missoulian) |url=https://www.newspapers.com/clip/89736594/gorgeous-gorge/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129085211/https://www.newspapers.com/clip/89736594/gorgeous-gorge/ |url-status=live }}] After a short concurrency with [US 93](/source/U.S._Route_93), I-90 runs along the north side of [Missoula](/source/Missoula%2C_Montana) and joins [US 12](/source/U.S._Route_12) to continue southeast along the foothills of the [Garnet Range](/source/Garnet_Range) and [Sapphire Mountains](/source/Sapphire_Mountains).[{{cite news |last=Smith |first=Mike |date=September 22, 2016 |title=Slower speed limit in works for most of Homestake Pass |page=A1 |work=[The Montana Standard](/source/The_Montana_Standard) |url=https://www.newspapers.com/clip/89736816/slower-speed-limit-in-works-for-most-of/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129085211/https://www.newspapers.com/clip/89736816/slower-speed-limit-in-works-for-most-of/ |url-status=live }}] The freeway travels east across the [Jefferson Valley](/source/Jefferson_River) and passes the headwaters of the [Missouri River](/source/Missouri_River) near [Three Forks](/source/Three_Forks%2C_Montana). It then enters the [Gallatin Valley](/source/Gallatin_Valley).[{{cite news |last=Jokerst |first=Gail |date=June 10, 2001 |title=Headwaters haven: Three Forks a quaint slice of Montana's history |page=H4 |work=The Spokesman-Review |url=https://www.newspapers.com/clip/89737271/headwaters-haven-three-forks-a-quaint/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129091500/https://www.newspapers.com/clip/89737271/headwaters-haven-three-forks-a-quaint/ |url-status=live }}]
I-90 travels around [Bozeman](/source/Bozeman%2C_Montana), where it is joined by [US 191](/source/U.S._Route_191), and crosses [Bozeman Pass](/source/Bozeman_Pass) between the [Bridger](/source/Bridger_Mountains_(Montana)) and [Gallatin](/source/Gallatin_Range) mountains. At the east end of the mountains, the freeway begins to follow the [Yellowstone River](/source/Yellowstone_River) and is briefly concurrent with [US 89](/source/U.S._Route_89), which serves [Yellowstone National Park](/source/Yellowstone_National_Park), and splits from US 191 at [Big Timber](/source/Big_Timber%2C_Montana). I-90 continues along the Yellowstone River through [Billings](/source/Billings%2C_Montana), overlapping with [US 87](/source/U.S._Route_87) and [US 212](/source/U.S._Route_212), until it reaches [Lockwood](/source/Lockwood%2C_Montana), the western terminus of [I-94](/source/Interstate_94). The freeways split and I-90 continues east across the [Bighorn Basin](/source/Bighorn_Basin) before it turns south near [Hardin](/source/Hardin%2C_Montana) to follow the [Little Bighorn River](/source/Little_Bighorn_River) into the [Crow Indian Reservation](/source/Crow_Indian_Reservation). The highway passes [the site](/source/Little_Bighorn_Battlefield_National_Monument) of the [Battle of the Little Bighorn](/source/Battle_of_the_Little_Bighorn) near [Crow Agency](/source/Crow_Agency%2C_Montana) and continues south along the river and the [Wolf Mountains](/source/Wolf_Mountains) into Wyoming.[{{cite news |last=Pyle |first=Richard |date=August 17, 2003 |title=The victors at Little Bighorn |page=N5 |work=[The Philadelphia Inquirer](/source/The_Philadelphia_Inquirer) |url=https://www.newspapers.com/clip/89737083/the-victors-at-little-bighorn/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129085212/https://www.newspapers.com/clip/89737083/the-victors-at-little-bighorn/ |url-status=live }}]
From 1995 to 1999, there was no numbered daytime [speed limit](/source/Speed_limits_in_the_United_States) on rural highways in Montana, including I-90.[{{cite news |last=Whitely |first=Peyton |date=December 10, 1995 |title=With a roar, Montana drops day speed limit |page=A1 |url=https://archive.seattletimes.com/archive/?date=19951210&slug=2157057 |work=The Seattle Times |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129090327/https://archive.seattletimes.com/archive/?date=19951210&slug=2157057 |url-status=live }}] The speed limit was simply defined as "reasonable and proper" as determined on a case-by-case basis by the [Montana Highway Patrol](/source/Montana_Highway_Patrol) until the [Montana Supreme Court](/source/Montana_Supreme_Court) ruled it was unconstitutional.[{{cite news |last=Robbins |first=Jim |date=December 25, 1998 |title=Montana's Speed Limit of ?? M.P.H. Is Overturned as Too Vague |page=A20 |url=https://www.nytimes.com/1998/12/25/us/montana-s-speed-limit-of-mph-is-overturned-as-too-vague.html |work=[The New York Times](/source/The_New_York_Times) |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129090327/https://www.nytimes.com/1998/12/25/us/montana-s-speed-limit-of-mph-is-overturned-as-too-vague.html |url-status=live }}] The maximum daytime speed limit in Montana was initially set at {{convert|75|mph|km/h|abbr=on|round=5}} in 1999 and was later raised to {{convert|80|mph|km/h|abbr=on|round=5}} in 2015.[{{cite news |last=Carter |first=Troy |date=October 1, 1995 |title=Montana interstate speed limit raised to 80 mph—mostly |url=https://www.bozemandailychronicle.com/news/montana-interstate-speed-limit-raised-to-80-mph-mostly/article_7dee866c-c7ca-5002-aee3-72c6335fd1be.html |work=[Bozeman Daily Chronicle](/source/Bozeman_Daily_Chronicle) |url-status=dead |archive-url=https://web.archive.org/web/20211129090331/https://www.bozemandailychronicle.com/news/montana-interstate-speed-limit-raised-to-80-mph-mostly/article_7dee866c-c7ca-5002-aee3-72c6335fd1be.html |archive-date=November 29, 2021 |accessdate=November 29, 2021}}]
===Wyoming===
{{Main|Interstate 90 in Wyoming}}
[[File:Sheridan.JPG|thumb|View of southern [Sheridan, Wyoming](/source/Sheridan%2C_Wyoming), from I-90|alt=A multi-story building named the "Mill Inn" and tall grain elevator, seen from an elevated vantage point]]
I-90 serves a portion of northeastern Wyoming that is primarily rural.[{{cite news |date=August 21, 2015 |title=Speed limit upped to 80 mph on part of I-90 in NE Wyoming |url=https://trib.com/news/state-regional/speed-limit-upped-to-mph-on-part-of-i-/article_28998e82-c006-5968-805f-8f84ccd4cc9c.html |work=[Casper Star-Tribune](/source/Casper_Star-Tribune) |agency=Associated Press |url-access=subscription |accessdate=December 7, 2025}}] The freeway, briefly concurrent to [US 14](/source/U.S._Route_14), travels southeast along a series of creeks to [Sheridan](/source/Sheridan%2C_Wyoming) in the northeastern foothills of the [Bighorn Mountains](/source/Bighorn_Mountains). I-90 and US 87 split in Sheridan and travel parallel to each other to [Fort Phil Kearny](/source/Fort_Phil_Kearny), where they rejoin and continue south past [Lake Desmet](/source/Lake_Desmet) to [Buffalo](/source/Buffalo%2C_Wyoming). The highways split again near Buffalo at a junction with [I-25](/source/Interstate_25), which overlaps with US 87 to [Casper](/source/Casper%2C_Wyoming).[{{cite map |author=Public Affairs Office |year=2011 |title=Wyoming Highway Map |url=https://ss-usa.s3.amazonaws.com/c/308475559/media/77046075a7b15c06968218036445366/Wyoming%20map%20side_v2.pdf |scale=1 inch = approx. 18 miles |location=Cheyenne |publisher=[Wyoming Department of Transportation](/source/Wyoming_Department_of_Transportation) |via=[Wyoming Office of Tourism](/source/Wyoming_Office_of_Tourism) |access-date=November 29, 2021 |archive-date=October 3, 2021 |archive-url=https://web.archive.org/web/20211003035101/https://ss-usa.s3.amazonaws.com/c/308475559/media/77046075a7b15c06968218036445366/Wyoming%20map%20side_v2.pdf |url-status=live }}]
From Buffalo, the highway turns east to cross the [Powder River Basin](/source/Powder_River_Basin), a region with several large coal mines.[{{cite news |last=Learn |first=Scott |date=July 1, 2012 |title=Coal clash: The Powder River Basin, where coal is king |url=https://www.oregonlive.com/environment/2012/06/coal_clash_out_of_the_gigantic.html |work=[The Oregonian](/source/The_Oregonian) |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129094519/https://www.oregonlive.com/environment/2012/06/coal_clash_out_of_the_gigantic.html |url-status=live }}] I-90 then reaches [Gillette](/source/Gillette%2C_Wyoming), where it begins a concurrency with US 14 and [US 16](/source/U.S._Route_16) to a three-way split in [Moorcroft](/source/Moorcroft%2C_Wyoming). The freeway continues into the [Bear Lodge Mountains](/source/Bear_Lodge_Mountains) (part of the [Black Hills](/source/Black_Hills)) and is rejoined in [Sundance](/source/Sundance%2C_Wyoming) by US 14, which looped north to serve the [Devils Tower](/source/Devils_Tower).[{{cite news |last=Eldredge |first=Kay |date=August 29, 1982 |title=The Spell of Devils Tower |at=sec. 10, p. 25 |url=https://www.nytimes.com/1982/08/29/travel/the-spell-of-devils-tower.html |work=The New York Times |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129102103/https://www.nytimes.com/1982/08/29/travel/the-spell-of-devils-tower.html |url-status=live }}] I-90/US 14 then continues northeast to [Beulah](/source/Beulah%2C_Wyoming), where it enters [South Dakota](/source/South_Dakota).[{{cite news |last=Henry |first=Neil |date=January 3, 1987 |title=Hush of the quiet season descends on the Black Hills |url=https://www.washingtonpost.com/archive/politics/1987/01/03/hush-of-the-quiet-season-descends-on-the-black-hills/00e14802-109a-4e1e-974e-90b2b5cc838e/ |newspaper=[The Washington Post](/source/The_Washington_Post) |accessdate=November 29, 2021}}] It then skirts the northern edge of Rapid City, which is served by spur route [I-190](/source/Interstate_190_(South_Dakota)), and passes [Ellsworth Air Force Base](/source/Ellsworth_Air_Force_Base) while it continues east across the plains. I-90 splits from US 14 near [Wall](/source/Wall%2C_South_Dakota), home to the [Wall Drug](/source/Wall_Drug) roadside attraction and located northeast of [Badlands National Park](/source/Badlands_National_Park).[{{cite news |last=Gordon |first=Kindra |date=June 11, 2006 |title=Get away from it all |page=D1 |work=[Rapid City Journal](/source/Rapid_City_Journal) |url=https://www.newspapers.com/clip/89737914/get-away-from-it-all/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129102613/https://www.newspapers.com/clip/89737914/get-away-from-it-all/ |url-status=live }}][{{cite map |year=2019 |title=State Highway Map of South Dakota |scale=1 inch = approx. 15.43 miles |url=https://dot.sd.gov/media/documents/CADD-Mapping/State/SD-Map_medium.pdf |location=Pierre |publisher=[South Dakota Department of Transportation](/source/South_Dakota_Department_of_Transportation) |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232847/https://dot.sd.gov/media/documents/CADD-Mapping/State/SD-Map_medium.pdf |url-status=live }}]
The freeway travels southeast into the [Buffalo Gap National Grassland](/source/Buffalo_Gap_National_Grassland) and also passes a pair of decommissioned [missile silo](/source/missile_silo)s that form the [Minuteman Missile National Historic Site](/source/Minuteman_Missile_National_Historic_Site).[{{cite map |year=2019 |title=Motor Vehicle Use Map: Buffalo Gap National Grassland, South Dakota |url=https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd701419.pdf |scale=Scale not given |location=Washington, D.C. |publisher=[United States Forest Service](/source/United_States_Forest_Service) |access-date=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129102615/https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd701419.pdf |url-status=dead }}][{{cite news |last=Bures |first=Frank |date=March 21, 2013 |title=Spring Travel Issue: Cold War-era tourist sites feature weapons of mass attraction |url=https://www.washingtonpost.com/blogs/liveblog/wp/2013/03/21/magazine-spring-travel-issue-cold-war-era-tourist-sites-feature-weapons-of-mass-attraction/ |newspaper=The Washington Post |accessdate=November 29, 2021}}] I-90 continues east along the top of a plateau that faces the [White River](/source/White_River_(Missouri_River_tributary)) and passes near [Kadoka](/source/Kadoka%2C_South_Dakota) and [Murdo](/source/Murdo%2C_South_Dakota). [US 83](/source/U.S._Route_83) briefly joins the highway from Murdo to [Vivian](/source/Vivian%2C_South_Dakota), where it splits off to serve the state capital of [Pierre](/source/Pierre%2C_South_Dakota).[{{cite news |date=June 15, 2021 |title=From cowboys to missiles: Places to stop this summer on your I-90 road trip |url=https://www.keloland.com/keloland-com-original/from-cowboys-to-missiles-places-to-stop-this-summer-on-your-i-90-road-trip/ |publisher=[Keloland.com](/source/KELO-TV) |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232850/https://www.keloland.com/keloland-com-original/from-cowboys-to-missiles-places-to-stop-this-summer-on-your-i-90-road-trip/ |url-status=live }}] From Chamberlain, I-90 continues east across the plains and past several small towns near the city of [Mitchell](/source/Mitchell%2C_South_Dakota). It then reaches the [Sioux Falls](/source/Sioux_Falls%2C_South_Dakota) area, where it bypasses the city to the north and intersects [I-29](/source/Interstate_29) and [I-229](/source/Interstate_229_(South_Dakota)). I-90 leaves Sioux Falls and crosses into [Minnesota](/source/Minnesota) near [Brandon](/source/Brandon%2C_South_Dakota).[{{cite web |year=2021 |title=Section 161.12: Additional Routes Added; Federal Aid |url=https://www.revisor.mn.gov/statutes/cite/161.12 |work=[Minnesota Statutes](/source/Minnesota_Statutes) |publisher=Minnesota Revisor's Office |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130051250/https://www.revisor.mn.gov/statutes/cite/161.12 |url-status=live }}] From the South Dakota border near [Beaver Creek](/source/Beaver_Creek%2C_Minnesota) to [Albert Lea](/source/Albert_Lea%2C_Minnesota), the freeway travels east across farmland and towns in the plains and rolling hills of the [Buffalo Ridge](/source/Buffalo_Ridge). It also intersects several north–south highways, including [US 75](/source/U.S._Route_75) in [Luverne](/source/Luverne%2C_Minnesota), [US 59](/source/U.S._Route_59) in [Worthington](/source/Worthington%2C_Minnesota), [US 71](/source/U.S._Route_71) in [Jackson](/source/Jackson%2C_Minnesota), and [US 169](/source/U.S._Route_169) in [Blue Earth](/source/Blue_Earth%2C_Minnesota). I-90 travels around the northern outskirts of Albert Lea and intersects [I-35](/source/Interstate_35) northeast of the city. It then reaches [Austin](/source/Austin%2C_Minnesota) and a brief concurrency with [US 218](/source/U.S._Route_218).[{{cite map |year=2021 |title=Minnesota 2021–2022 Official Highway Map |url=https://www.dot.state.mn.us/statemap/2019/Frontside_2021.pdf |scale=Scale not given |location=St. Paul |publisher=[Minnesota Department of Transportation](/source/Minnesota_Department_of_Transportation) |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129111357/http://www.dot.state.mn.us/statemap/2019/Frontside_2021.pdf |url-status=live }}]
From Austin, the freeway turns northeast to head towards [Rochester](/source/Rochester%2C_Minnesota), which it bypasses to the south and intersects [US 63](/source/U.S._Route_63) and [US 52](/source/U.S._Route_52). I-90 continues east into the hilly [Driftless Area](/source/Driftless_Area) and descends from the bluffs that overlook [Lake Onalaska](/source/Lake_Onalaska) on the [Mississippi River](/source/Mississippi_River).[{{cite news |last=Stoll |first=Mike |date=May 26, 2017 |title=I-90 and the face of Mower County |url=https://www.austindailyherald.com/2017/05/i-90-and-the-face-of-mower-county/ |work=[Austin Daily Herald](/source/Austin_Daily_Herald) |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232849/https://www.austindailyherald.com/2017/05/i-90-and-the-face-of-mower-county/ |url-status=live }}] It turns southeast at [Dakota](/source/Dakota%2C_Minnesota) and is joined by US 14 until the highways split near [La Crescent](/source/La_Crescent%2C_Minnesota). I-90 turns east before it reaches La Crescent, where it crosses the Mississippi River on the [Dresbach Bridge](/source/Dresbach_Bridge) into Wisconsin.[{{cite news |last=Hubbuch |first=Chris |date=October 21, 2016 |title=Minnesota, Wisconsin celebrate completion of I-90 bridge |url=https://lacrossetribune.com/news/local/minnesota-wisconsin-celebrate-completion-of-i-90-bridge/article_4c810c59-8678-56cb-a34a-e27ef81e07b2.html |work=[La Crosse Tribune](/source/La_Crosse_Tribune) |url-access=subscription |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130051250/https://lacrossetribune.com/news/local/minnesota-wisconsin-celebrate-completion-of-i-90-bridge/article_4c810c59-8678-56cb-a34a-e27ef81e07b2.html |url-status=live }}]
===Wisconsin===
{{Main|Interstate 90 in Wisconsin}}
[[File:I 90 bridge La Crosse.jpg|thumb|upright=0.767|[I-90 Mississippi River](/source/I-90_Mississippi_River_Bridge) bridge near [La Crosse](/source/La_Crosse%2C_Wisconsin)]]
I-90 enters Wisconsin near [La Crosse](/source/La_Crosse%2C_Wisconsin) and bisects [French Island](/source/French_Island%2C_Wisconsin) before it reaches [Onalaska](/source/Onalaska%2C_Wisconsin). This section is briefly concurrent to [US 53](/source/U.S._Route_53) between La Crosse and Onalaska. The freeway travels east, generally along the [La Crosse River](/source/La_Crosse_River), through several towns and [Fort McCoy](/source/Fort_McCoy%2C_Wisconsin) before it reaches a junction with I-94 in [Tomah](/source/Tomah%2C_Wisconsin). The two Interstates join at Tomah and travel southeast along the edge of the hills of the [Western Upland](/source/Western_Upland), following the [Lemonweir](/source/Lemonweir_River) and [Wisconsin](/source/Wisconsin_River) rivers. It passes [Wisconsin Dells](/source/Wisconsin_Dells%2C_Wisconsin), situated on the [gorge of the same name](/source/Dells_of_the_Wisconsin_River) and home to several [water park](/source/water_park)s and [theme park](/source/theme_park)s.[{{cite news |last=Noel |first=Josh |date=June 14, 2016 |title=A first-timer from Chicago dives into the Wisconsin Dells |url=https://www.chicagotribune.com/travel/ct-trav-0626-dells-first-timer-20160613-story.html |work=[Chicago Tribune](/source/Chicago_Tribune) |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232850/https://www.chicagotribune.com/travel/ct-trav-0626-dells-first-timer-20160613-story.html |url-status=live }}][{{cite map |year=2019 |title=Wisconsin 2019–2020 State Highway Map |scale=1 inch = approx. 13 miles |url=https://wisconsindot.gov/Documents/travel/road/hwy-maps/statemap.pdf |location=Madison |publisher=[Wisconsin Department of Transportation](/source/Wisconsin_Department_of_Transportation) |accessdate=November 29, 2021 |archive-date=January 29, 2022 |archive-url=https://web.archive.org/web/20220129024329/https://wisconsindot.gov/Documents/travel/road/hwy-maps/statemap.pdf |url-status=live }}]
The freeway travels east from Wisconsin Dells to the [Portage](/source/Portage%2C_Wisconsin) area, where [I-39](/source/Interstate_39) begins its concurrency with I-90/I-94. The highway then crosses the Wisconsin River and travels south towards [Madison](/source/Madison%2C_Wisconsin), where it forms an eastern bypass of the city. East of Madison, I-94 separates from I-39/I-90, which continues southeast through [Edgerton](/source/Edgerton%2C_Wisconsin) and [Janesville](/source/Janesville%2C_Wisconsin). The highway turns south and enters [Beloit](/source/Beloit%2C_Wisconsin), where it intersects [I-43](/source/Interstate_43) and crosses into [Illinois](/source/Illinois).[{{cite map |date=January 2020 |title=Illinois Tollway 2020 Complimentary Map |at=[https://www.illinoistollway.com/documents/20184/145046/TollwayMap_01_29_2020-SideB.pdf Chicago and Vicinity] inset |url=https://www.illinoistollway.com/documents/20184/145046/TollwayMap_01_22_2020-SideA.pdf |scale=Scale not given |location=Downers Grove |publisher=[Illinois State Toll Highway Authority](/source/Illinois_State_Toll_Highway_Authority) |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130073626/https://www.illinoistollway.com/documents/20184/145046/TollwayMap_01_22_2020-SideA.pdf |url-status=live }}]
The tollway cuts through the northwestern suburbs of Chicago, where it intersects [I-290](/source/Interstate_290_(Illinois)) in [Schaumburg](/source/Schaumburg%2C_Illinois) and passes the north side of [O'Hare International Airport](/source/O'Hare_International_Airport). On the east side of the airport in [Rosemont](/source/Rosemont%2C_Illinois), I-90 intersects [I-294](/source/Interstate_294) and [I-190](/source/Interstate_190_(Illinois)), the latter of which serves the airport's passenger terminals and marks the end of the tollway.[{{cite news |last=Hilkevitch |first=Jon |date=December 5, 2013 |title=O'Hare Blue Line to stay open during 4-year renovation |url=https://www.chicagotribune.com/news/ct-xpm-2013-12-05-chi-4year-492m-blue-line-project-to-be-announced-today-20131205-story.html |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009230610/https://www.chicagotribune.com/ |url-status=live }}] I-90 turns southeast and is rejoined by I-94 in [Irving Park](/source/Irving_Park%2C_Chicago), where it gains a set of [reversible express lanes](/source/reversible_lane) that travel for {{convert|6.2|mi|km}} toward the [Near West Side](/source/Near_West_Side%2C_Chicago).[{{cite news |last=Hilkevitch |first=Jon |date=August 22, 2011 |title=Drivers frustrated by Kennedy express lanes |url=https://www.chicagotribune.com/autos/ct-xpm-2011-08-22-ct-met-getting-around-0822-20110822-story.html |at=sec. 1, p. 4 |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130071337/https://www.chicagotribune.com/autos/ct-xpm-2011-08-22-ct-met-getting-around-0822-20110822-story.html |url-status=live }}]
The Kennedy Expressway travels south through the Near West Side, opposite the [Chicago River](/source/Chicago_River) from the [Chicago Loop](/source/Chicago_Loop) (the city's central business district), and intersects I-290 again at the [Jane Byrne Interchange](/source/Jane_Byrne_Interchange).[{{cite news |last=Wronski |first=Richard |date=November 23, 2015 |title=Kennedy Expressway tops new list of nation's most congested highways |url=https://www.chicagotribune.com/news/ct-kennedy-congestion-met-20151123-story.html |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130071339/https://www.chicagotribune.com/news/ct-kennedy-congestion-met-20151123-story.html |url-status=live }}] The freeway continues onto the [Dan Ryan Expressway](/source/Dan_Ryan_Expressway) and crosses the Chicago River near [Chinatown](/source/Chinatown%2C_Chicago) and an interchange with [I-55](/source/Interstate_55). The Dan Ryan is the widest section of I-90, at 12 through lanes, and is split between [local and express lanes](/source/Local%E2%80%93express_lanes).[{{cite web |date=July 27, 2010 |title=Urban Highways with the Most Lanes |url=https://www.fhwa.dot.gov/policyinformation/tables/01.pdf |publisher=Federal Highway Administration |access-date=December 3, 2021 |archive-date=January 6, 2022 |archive-url=https://web.archive.org/web/20220106214052/http://www.fhwa.dot.gov/policyinformation/tables/01.pdf |url-status=live }}][{{cite news |last=Hilkevitch |first=Jon |date=March 26, 2006 |title=Buckle up, it looks like a long ride |at=sec. 1, p. 10 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89956956/buckle-up-it-looks-like-a-long-ride/ |via=Newspapers.com |accessdate=December 3, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232850/https://www.newspapers.com/clip/89956956/buckle-up-it-looks-like-a-long-ride/ |url-status=live }}] I-90/I-94 is joined by the ["L" Red Line](/source/Red_Line_(CTA)) in the median of the expressway through the city's [South Side](/source/South_Side%2C_Chicago),[{{cite news |last=Channick |first=Robert |date=January 31, 2017 |title=IIT sells oldest building for redevelopment |url=https://www.chicagotribune.com/business/ct-iit-redevelop-historic-building-0201-biz-20170131-story.html |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130071922/https://www.chicagotribune.com/business/ct-iit-redevelop-historic-building-0201-biz-20170131-story.html |url-status=live }}] I-90 splits from the Dan Ryan Expressway in [Englewood](/source/Englewood%2C_Chicago) and turns southeast onto the tolled [Chicago Skyway](/source/Chicago_Skyway). The tolled Skyway travels towards the Indiana state line, which the freeway crosses near the [Calumet River](/source/Calumet_River) in the [East Side](/source/East_Side%2C_Chicago).[{{cite map |year=2021 |title=Indiana Roadway Map 2021 |url=https://www.in.gov/indot/files/2021_Roadway_Map-NEW-SIZEuseHQextendededit.pdf |publisher=[Indiana Department of Transportation](/source/Indiana_Department_of_Transportation) |scale=Scale not given |location=Indianapolis |accessdate=November 30, 2021 |archive-date=November 2, 2021 |archive-url=https://web.archive.org/web/20211102152650/https://www.in.gov/indot/files/2021_Roadway_Map-NEW-SIZEuseHQextendededit.pdf |url-status=live }}] From the Illinois state line, the tollway travels south through [Hammond](/source/Hammond%2C_Indiana) and turns east to follow the [Grand Calumet River](/source/Grand_Calumet_River) through northern [Gary](/source/Gary%2C_Indiana), where it intersects [US 41](/source/U.S._Route_41) and US 12. I-90 then crosses [I-65](/source/Interstate_65) in eastern Gary and I-94 in [Lake Station](/source/Lake_Station%2C_Indiana), where it begins a concurrency with I-80.[{{cite map |author=ODOT Office of Technical Services |date=April 2019 |title=Ohio Official Transportation Map |scale=1 inch = 11 miles |url=https://www.transportation.ohio.gov/static/About/maps/2019StateMap-Back.pdf |at=[https://www.transportation.ohio.gov/static/About/maps/2019StateMap-Front.pdf Cleveland] inset |location=Columbus |publisher=[Ohio Department of Transportation](/source/Ohio_Department_of_Transportation) |accessdate=November 30, 2021 |archive-date=July 14, 2021 |archive-url=https://web.archive.org/web/20210714191632/https://www.transportation.ohio.gov/static/About/maps/2019StateMap-Back.pdf |url-status=live }}]
The turnpike travels southeast through a rural area near the southwest shore of [Lake Erie](/source/Lake_Erie), where it passes the cities of [Fremont](/source/Fremont%2C_Ohio) and [Sandusky](/source/Sandusky%2C_Ohio). Near Norwalk, the highway turns northeast to follow [State Route 2](/source/Ohio_State_Route_2) (SR 2) and heads to [Elyria](/source/Elyria%2C_Ohio), where I-90 splits from I-80 (which remains on the turnpike). The freeway then merges with SR 2 and continues northeast through the lakeshore suburbs west of [Cleveland](/source/Cleveland%2C_Ohio), including [Rocky River](/source/Rocky_River%2C_Ohio) and [Lakewood](/source/Lakewood%2C_Ohio). I-90 and SR 2 separate after crossing the [Rocky River](/source/Rocky_River_(Ohio)) and travel parallel to each other as they enter Cleveland. I-90 continues through the southwestern residential neighborhoods of Cleveland and reaches a junction with [I-71](/source/Interstate_71) and [I-490](/source/Interstate_490_(Ohio)) in [Tremont](/source/Tremont%2C_Cleveland), where it turns north.[{{cite news |last=Grant |first=Alison |date=November 8, 2013 |title=Inner Belt Bridge brings crowd of onlookers with cameras, babies in strollers |url=https://www.cleveland.com/metro/2013/11/inner_belt_bridge_brings_crowd.html |work=[The Plain Dealer](/source/The_Plain_Dealer) |accessdate=November 30, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130094152/https://www.cleveland.com/metro/2013/11/inner_belt_bridge_brings_crowd.html |url-status=live }}] The Innerbelt skirts the south side of Downtown Cleveland, where it intersects [I-77](/source/Interstate_77) near [Progressive Field](/source/Progressive_Field) and turns north to bisect the [Goodrich–Kirtland Park](/source/Goodrich%E2%80%93Kirtland_Park) neighborhood.[{{cite news |last=Naymik |first=Mark |date=August 3, 2021 |title=Cleveland's Dead Man's Curve not getting straightened any time soon: Mark Naymik Reports |url=https://www.wkyc.com/article/news/local/cleveland/cleveland-dead-mans-curve-not-getting-straightened-any-time-soon/95-2e73c304-f903-4045-9e9c-3a8159156344 |publisher=[WKYC](/source/WKYC) |accessdate=November 30, 2021}}]) and rejoins SR 2 on the [Cleveland Memorial Shoreway](/source/Cleveland_Memorial_Shoreway) until they split again in [Euclid](/source/Euclid%2C_Ohio). I-90 briefly turns southeast but resumes its northeastern route after a junction with [I-271](/source/Interstate_271) in [Willoughby Hills](/source/Willoughby_Hills%2C_Ohio). The freeway travels parallel to the Lake Erie shoreline through farmland and exurban towns and crosses into Pennsylvania near [Conneaut](/source/Conneaut%2C_Ohio).[{{cite map |author=PennDOT Bureau of Planning and Research |year=2020 |title=Pennsylvania Tourism and Transportation Map |url=https://gis.penndot.gov/BPR_PDF_FILES/MAPS/Statewide/otm/otmplot_web.pdf |scale=Scale not given |location=Harrisburg |publisher=[Pennsylvania Department of Transportation](/source/Pennsylvania_Department_of_Transportation) |accessdate=November 30, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130100700/https://gis.penndot.gov/BPR_PDF_FILES/MAPS/Statewide/otm/otmplot_web.pdf |url-status=live }}] It enters the state in [Springfield Township](/source/Springfield_Township%2C_Erie_County%2C_Pennsylvania) and passes through rural areas along the lake shore, parallel to US 20 and the [Lake Road](/source/Pennsylvania_Route_5). The freeway then travels through the southern outskirts of [Erie](/source/Erie%2C_Pennsylvania), where it intersects [I-79](/source/Interstate_79) and [US 19](/source/U.S._Route_19). I-90 returns to the rural areas of northeastern Erie County and intersects [I-86](/source/Interstate_86_(Pennsylvania%E2%80%93New_York)) before it reaches the New York state line near the borough of [North East](/source/North_East%2C_Pennsylvania).[{{cite map |year=2001 |title=New York State Map |url=http://iloveny.com/_files/map_nys_base.pdf |at=[https://web.archive.org/web/20091231053955/http://iloveny.com/_files/map_metro_albany.pdf Albany/Schenectady/Troy Metro] inset|cartography=Maps.com |scale=Scale not given |location=Albany |publisher=[New York State Department of Economic Development](/source/New_York_State_Department_of_Economic_Development) |url-status=dead |archive-url=https://web.archive.org/web/20091231053250/http://iloveny.com/_files/map_nys_base.pdf |archive-date=December 31, 2009 |accessdate=November 30, 2021}}] At a junction with I-290 near [Buffalo Niagara International Airport](/source/Buffalo_Niagara_International_Airport), I-90 turns east to follow the historic [Water Level Route](/source/Water_Level_Route) of the [New York Central Railroad](/source/New_York_Central_Railroad), itself parallel to the 19th-century [Erie Canal](/source/Erie_Canal).[{{cite web |year=2020 |title=Erie Canalway Map & Guide |pages=4–5 |url=http://npshistory.com/publications/erie/newspaper/2020.pdf |publisher=National Park Service |url-status=dead |archive-url=https://web.archive.org/web/20211201043819/http://npshistory.com/publications/erie/newspaper/2020.pdf |archive-date=December 1, 2021 |accessdate=November 30, 2021}}][{{cite news |last=O'Donnell |first=Harry |date=June 25, 1950 |title=Thruway to Surpass Pennsylvania Turnpike |page=13A |work=[Rochester Democrat and Chronicle](/source/Rochester_Democrat_and_Chronicle) |url=https://www.newspapers.com/clip/89843028/thruway-to-surpass-pennsylvania-turnpike/ |via=Newspapers.com |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201043817/https://www.newspapers.com/clip/89843028/thruway-to-surpass-pennsylvania-turnpike/ |url-status=live }}]
The Thruway passes south of [Rochester](/source/Rochester%2C_New_York), which it serves via a loop on [I-490](/source/Interstate_490_(New_York)) and the direct north–south spur [I-390](/source/Interstate_390_(New_York)). I-90 travels through the [Finger Lakes](/source/Finger_Lakes) region and moves closer to the Erie Canal as it approaches the [Syracuse](/source/Syracuse%2C_New_York) area. It travels through the city's northern outskirts, where it intersects [I-690](/source/Interstate_690_(New_York)), [I-81](/source/Interstate_81), and [I-481](/source/Interstate_481) from west to east.[{{cite map |author=[Syracuse Metropolitan Transportation Council](/source/Syracuse_Metropolitan_Transportation_Council) |date=June 2016 |title=2016 Highway Map of Onondaga County, New York |url=http://www.ongov.net/dot/documents/2016HighwayMapofOnondagaCounty.pdf |scale=Scale not given |location=Syracuse |publisher=[Onondaga County Department of Transportation](/source/Onondaga_County%2C_New_York) |accessdate=November 30, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232852/http://www.ongov.net/dot/documents/2016HighwayMapofOnondagaCounty.pdf |url-status=live }}] It then continues to [Utica](/source/Utica%2C_New_York), where the Thruway runs along the north side of the [Mohawk River](/source/Mohawk_River) (part of the Erie Canal).[{{cite web |title=Interchange/Exit Listings |url=https://www.thruway.ny.gov/travelers/interchanges/index.html |publisher=[New York State Thruway Authority](/source/New_York_State_Thruway_Authority) |accessdate=November 30, 2021 |archive-date=September 8, 2021 |archive-url=https://web.archive.org/web/20210908054601/https://www.thruway.ny.gov/travelers/interchanges/index.html |url-status=live }}] as a result, the mileposts and exit numbers on I-90 through most of New York run backwards compared to the federal preference for mile-based numbers increasing from west to east.[{{cite news |last=Rubel |first=Abigail |date=September 27, 2021 |title=Getting There: Will New York change its highway exit numbers? |url=https://www.timesunion.com/news/article/Getting-There-Will-New-York-change-its-highway-16488756.php |work=[Times Union](/source/Times_Union_(Albany)) |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201045209/https://www.timesunion.com/news/article/Getting-There-Will-New-York-change-its-highway-16488756.php |url-status=live }}] The Berkshire Connector uses west-to-east mileposts and exit numbers with a "B" prefix;[{{cite news |date=May 31, 2006 |title=50 Years of freedom |url=https://www.overdriveonline.com/business/article/14879885/50-years-of-freedom |work=[Overdrive](/source/Overdrive_(U.S._magazine)) |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201045209/https://www.overdriveonline.com/business/article/14879885/50-years-of-freedom |url-status=live }}][{{cite web |year=2006 |title=Tennessee's Interstate System – Frequently Asked Questions |url=https://www.tn.gov/tdot/100years-home/100years-interstate/100-years-interstate-system-faqs.html |publisher=[Tennessee Department of Transportation](/source/Tennessee_Department_of_Transportation) |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201045209/https://www.tn.gov/tdot/100years-home/100years-interstate/100-years-interstate-system-faqs.html |url-status=live }}]
===Massachusetts===
{{Main|Massachusetts Turnpike}}
[[File:Fenway neighborhood seen from Prudential Skywalk.jpg|thumb|right|View of the [Massachusetts Turnpike](/source/Massachusetts_Turnpike) in Boston's [Fenway–Kenmore](/source/Fenway%E2%80%93Kenmore) neighborhood, seen from the [Prudential Tower](/source/Prudential_Tower). [Fenway Park](/source/Fenway_Park) is visible at top left.|alt=Aerial view of a divided highway in a dense urban neighborhood, passing under several bridges and near multi-story buildings and a baseball stadium]]
I-90 in Massachusetts is concurrent with the entirety of the [Massachusetts Turnpike](/source/Massachusetts_Turnpike) (also known as "the Pike" or "MassPike").[{{cite map |author=MassDOT Central Transportation Planning Staff |year=2019 |title=Massachusetts Official Transportation Map |scale=1 inch = 6 miles |url=https://www.mass.gov/doc/official-transportation-map-english/download |location=Boston |publisher=[Massachusetts Department of Transportation](/source/Massachusetts_Department_of_Transportation) |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201060239/https://www.mass.gov/doc/official-transportation-map-english/download |url-status=live }}] The turnpike begins at the New York state line in [West Stockbridge](/source/West_Stockbridge%2C_Massachusetts) and travels southeast through the [Berkshires](/source/Berkshires) to the [Pioneer Valley](/source/Pioneer_Valley).[{{cite news |last=Carlinsky |first=Dan |date=September 21, 1975 |title=...And Back Roads Of Massachusetts |at=sec. 10, p. 1 |url=https://www.nytimes.com/1975/09/21/archives/and-back-roads-of-massachusetts-fall-foliage-massachusetts.html |work=The New York Times |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201060236/https://www.nytimes.com/1975/09/21/archives/and-back-roads-of-massachusetts-fall-foliage-massachusetts.html |url-status=live }}] The highway travels through the northern suburbs of [Springfield](/source/Springfield%2C_Massachusetts), where it intersects [I-91](/source/Interstate_91) and crosses the [Connecticut River](/source/Connecticut_River) into [Chicopee](/source/Chicopee%2C_Massachusetts). I-90 then crosses over [I-391](/source/Interstate_391) without an interchange and serves as the northern terminus of [I-291](/source/Interstate_291_(Massachusetts)) on the eastern outskirts of the city. The turnpike continues east through the hills of [Central Massachusetts](/source/Central_Massachusetts) and serves as the eastern terminus of [I-84](/source/Interstate_84_(Pennsylvania%E2%80%93Massachusetts)) in the town of [Sturbridge](/source/Sturbridge%2C_Massachusetts).[{{cite news |last=Rubin |first=Eilhu |date=May 27, 2012 |title=How to look at the Prudential |url=https://www.bostonglobe.com/ideas/2012/05/26/how-look-pru/GRnscdL9VQjJQ5AsW6yXML/story.html |work=[The Boston Globe](/source/The_Boston_Globe) |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201060237/https://www.bostonglobe.com/ideas/2012/05/26/how-look-pru/GRnscdL9VQjJQ5AsW6yXML/story.html |url-status=live }}]
I-90 intersects [I-93](/source/Interstate_93) on the south side of [Downtown Boston](/source/Downtown_Boston) and travels under the [Fort Point Channel](/source/Fort_Point_Channel) to serve the [Seaport District](/source/Seaport_District). The turnpike then enters the [Ted Williams Tunnel](/source/Ted_Williams_Tunnel), which travels northeast under [Boston Harbor](/source/Boston_Harbor) to the passenger terminals at [Logan International Airport](/source/Logan_International_Airport).[{{cite news |last=Flint |first=Anthony |date=December 29, 2015 |title=10 years later, did the Big Dig deliver? |url=https://www.bostonglobe.com/magazine/2015/12/29/years-later-did-big-dig-deliver/tSb8PIMS4QJUETsMpA7SpI/story.html |work=The Boston Globe |accessdate=November 30, 2021 |archive-date=December 5, 2020 |archive-url=https://web.archive.org/web/20201205214626/https://www.bostonglobe.com/magazine/2015/12/29/years-later-did-big-dig-deliver/tSb8PIMS4QJUETsMpA7SpI/story.html |url-status=live }}] After it passes the northwest side of the airport, I-90 terminates at an interchange with [Route 1A](/source/Massachusetts_Route_1A) in [East Boston](/source/East_Boston).[{{cite web |title=The Big Dig: tunnels and bridges |url=https://www.mass.gov/info-details/the-big-dig-tunnels-and-bridges |publisher=Massachusetts Department of Transportation |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201060242/https://www.mass.gov/info-details/the-big-dig-tunnels-and-bridges |url-status=live }}]
==History==
===Predecessors and establishment===
An east–west controlled access highway to serve the Northern United States was proposed in the early 20th century in several federal government documents, including reports from the [Bureau of Public Roads](/source/Bureau_of_Public_Roads) in the 1930s and 1940s.[{{cite news |last=Miller |first=James N. |date=July 23, 1939 |title=14,000 Mile Super Highway To Speed Transportation |page=3 |work=The Seattle Times}}][{{cite magazine |last=Pfeiffer |first=David A. |date=Summer 2006 |title=Ike's Interstates at 50 |pages=14–18 |url=https://www.archives.gov/publications/prologue/2006/summer/interstates.html |magazine=[Prologue](/source/Prologue_(magazine)) |publisher=[National Archives and Records Administration](/source/National_Archives_and_Records_Administration) |issn=0033-1031 |oclc=321015582 |accessdate=April 11, 2022 |archive-date=March 2, 2011 |archive-url=https://web.archive.org/web/20110302235254/http://archives.gov/publications/prologue/2006/summer/interstates.html |url-status=live }}] The Interstate Highway System was created by the [Federal-Aid Highway Act of 1956](/source/Federal-Aid_Highway_Act_of_1956), which was approved by the [U.S. Congress](/source/U.S._Congress) and signed into law on June 26, 1956.[{{cite web |last=Weingroff |first=Richard F. |year=2006 |title=Designating the Urban Interstates |url=https://www.fhwa.dot.gov/infrastructure/fairbank.cfm |publisher=Federal Highway Administration |accessdate=November 30, 2021 |archive-date=December 30, 2017 |archive-url=https://web.archive.org/web/20171230231552/https://www.fhwa.dot.gov/infrastructure/fairbank.cfm |url-status=live }}] I-90 was assigned to the northernmost transcontinental route in the system by the [American Association of State Highway Officials](/source/American_Association_of_State_Highway_Officials) in 1957.[{{cite map |author=American Association of State Highway Officials |date=August 14, 1957 |title=Official Route Numbering for the National System of Interstate and Defense Highways |url=https://upload.wikimedia.org/wikipedia/commons/9/9c/Interstate_Highway_plan_August_14%2C_1957.jpg |scale=Scale not given |location=Washington, D.C. |publisher=[Public Roads Administration](/source/Public_Roads_Administration) |via=Wikimedia Commons |accessdate=November 30, 2021 |archive-date=May 3, 2021 |archive-url=https://web.archive.org/web/20210503214401/https://upload.wikimedia.org/wikipedia/commons/9/9c/Interstate_Highway_plan_August_14,_1957.jpg |url-status=live }}][{{cite news |last=Hodenfield |first=G. K. |date=September 26, 1957 |title=New Markers to Dot Super Roads |page=1 |work=[The Indianapolis News](/source/The_Indianapolis_News) |url=https://www.newspapers.com/clip/89671853/new-markers-to-dot-super-roads/ |via=Newspapers.com |accessdate=November 30, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129053729/https://www.newspapers.com/clip/89671853/new-markers-to-dot-super-roads/ |url-status=live }}]
The freeway would travel along existing parts of the [United States Numbered Highway System](/source/United_States_Numbered_Highway_System), which was established at the suggestion of the federal government in 1926 to replace the named [auto trail](/source/auto_trail)s.[{{cite web |last=Weingroff |first=Richard F. |title=From Names to Numbers: The Origins of the U.S. Numbered Highway System |url=https://www.fhwa.dot.gov/infrastructure/numbers.cfm |work=Highway History |publisher=Federal Highway Administration |accessdate=December 9, 2021 |archive-date=September 1, 2019 |archive-url=https://web.archive.org/web/20190901182531/https://www.fhwa.dot.gov/infrastructure/numbers.cfm |url-status=live }}] Among these auto trails, which were generally designated by private motorist organizations, were the transcontinental [Yellowstone Trail](/source/Yellowstone_Trail) and [National Parks Highway](/source/National_Parks_Highway), created in the 1910s along the future route of I-90 between Seattle and Boston.[{{cite magazine |last=Westgard |first=A. L. |author-link=A. L. Westgard |date=June 7, 1919 |title=Let's Go: Here Are the Motor Trails from Atlantic to Pacific—and All Points Between |pages=360–361, 379 |magazine=[The Independent](/source/The_Independent_(New_York_City)) |volume=98 |issue=3678 |oclc=4927591 |url=https://books.google.com/books?id=LvDlAAAAMAAJ&pg=PA360 |via=Google Books |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233351/https://books.google.com/books?id=LvDlAAAAMAAJ&pg=PA360 |url-status=live }}][{{cite news |last=Burkhart |first=Dan |date=February 17, 1998 |title=Interstate 90 had rough, rutted forerunner |page=8M |work=[Great Falls Tribune](/source/Great_Falls_Tribune) |url=https://www.newspapers.com/clip/90281383/interstate-90-had-rough-rutted/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 9, 2021 |archive-url=https://web.archive.org/web/20211209081242/https://www.newspapers.com/clip/90281383/interstate-90-had-rough-rutted/ |url-status=live }}] The national numbered highways along the corridor included [US 10](/source/U.S._Route_10) from Seattle to Billings, Montana; [US 87](/source/U.S._Route_87) from Billings to [Buffalo, Wyoming](/source/Buffalo%2C_Wyoming); [US 16](/source/U.S._Route_16) from Buffalo to [Portage, Wisconsin](/source/Portage%2C_Wisconsin); [US 51](/source/U.S._Route_51) from Portage to [Rockford, Illinois](/source/Rockford%2C_Illinois) and [US 20](/source/U.S._Route_20) from Rockford to Boston.[{{cite book |author=Joint Board on Interstate Highways |year=1925 |title=Report of Joint Board on Interstate Highways, October 30, 1925, Approved by the Secretary of Agriculture, November 18, 1925 |chapter=Appendix VI: Descriptions of the Interstate Routes Selected, with Numbers Assigned |pages=50–56 |chapter-url=https://en.wikisource.org/wiki/Report_of_Joint_Board_on_Interstate_Highways_October_30,_1925#48 |location=Washington, D.C. |publisher=[United States Department of Agriculture](/source/United_States_Department_of_Agriculture) |id={{OCLC|733875457|55123355|71026428}} |via=[Wikisource](/source/Wikisource) |accessdate=December 9, 2021 |archive-date=November 14, 2017 |archive-url=https://web.archive.org/web/20171114145350/https://en.wikisource.org/wiki/Report_of_Joint_Board_on_Interstate_Highways_October_30,_1925#48 |url-status=live }}][{{cite map |author1= [Bureau of Public Roads](/source/Bureau_of_Public_Roads) |author2= [American Association of State Highway Officials](/source/American_Association_of_State_Highway_Officials) |date= November 11, 1926 |title= United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials |url= https://commons.wikimedia.org/wiki/File:United_States_System_of_Highways_Adopted_for_Uniform_Marking_by_the_American_Association_of_State_Highway_Officials.jpg |scale= 1:7,000,000 |location= Washington, DC |publisher= [United States Geological Survey](/source/United_States_Geological_Survey) |oclc= 32889555 |via= [Wikimedia Commons](/source/Wikimedia_Commons) |accessdate= December 9, 2021 |archive-date= April 13, 2017 |archive-url= https://web.archive.org/web/20170413153913/https://commons.wikimedia.org/wiki/File:United_States_System_of_Highways_Adopted_for_Uniform_Marking_by_the_American_Association_of_State_Highway_Officials.jpg |url-status= live }}]
===Tollways and urban construction===
[[File:Chicago Circle Interchange 2018.jpg|thumb|right|Aerial view of the [Circle Interchange](/source/Circle_Interchange) in Chicago during reconstruction in 2018|alt=Aerial view of a major freeway interchange with several flyover ramps set within an urban neighborhood. Several ramps have exposed steel beams and other unfinished surfaces, showing signs of construction activity.]]
Major portions of I-90 in the Midwest and Northeastern states used existing toll roads built by state governments in the 1950s and 1960s. The [Northwest Tollway](/source/Jane_Addams_Memorial_Tollway), [Chicago Skyway](/source/Chicago_Skyway), [Indiana Toll Road](/source/Indiana_Toll_Road), [Ohio Turnpike](/source/Ohio_Turnpike), [New York State Thruway](/source/New_York_State_Thruway), and [Massachusetts Turnpike](/source/Massachusetts_Turnpike) all predate I-90 and were incorporated into the route.[{{cite news |last=Ingraham |first=Joseph C. |date=May 24, 1959 |title=Boston to Chicago: New Section of Thruway Completes Express Route Between Cities |page=XX1 |url=https://www.nytimes.com/1959/05/24/archives/boston-to-chicago-new-section-of-thruway-completes-express-route.html |work=The New York Times |accessdate=December 4, 2021 |archive-date=July 22, 2018 |archive-url=https://web.archive.org/web/20180722095852/https://www.nytimes.com/1959/05/24/archives/boston-to-chicago-new-section-of-thruway-completes-express-route.html |url-status=live }}] This also meant that portions of the route did not adhere to [Interstate Highway standards](/source/Interstate_Highway_standards), but they were either deemed adequate or rebuilt to conform by the 1980s.[{{cite news |last=Gough |first=William |date=September 30, 1987 |title=Across the lake in concrete: A ride on new I-90 span bridges a gap in the imagination |page=E1 |work=The Seattle Times}}] The Pennsylvania section was planned in the early 1950s as the "Erie Extension" of the [Pennsylvania Turnpike](/source/Pennsylvania_Turnpike),[{{cite news |last=Snyder |first=Thomas P. |date=September 7, 1953 |title=Turnpike Link to Erie Assured, Survey of Best Route Begins |page=8 |work=[Pittsburgh Sun-Telegraph](/source/Pittsburgh_Sun-Telegraph) |url=https://www.newspapers.com/clip/89848370/turnpike-link-to-erie-assured-survey/ |via=Newspapers.com |accessdate=December 1, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233351/https://www.newspapers.com/clip/89848370/turnpike-link-to-erie-assured-survey/ |url-status=live }}] but was instead completed as a toll-free road in October 1960 with federal funds.[{{cite news |date=October 24, 1960 |title=Erie Throughway Is Scheduled To Be Officially Open Friday |page=3 |work=[The Titusville Herald](/source/The_Titusville_Herald) |url=https://www.newspapers.com/clip/89848487/erie-throughway-is-scheduled-to-be/ |via=Newspapers.com |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201084457/https://www.newspapers.com/clip/89848487/erie-throughway-is-scheduled-to-be/ |url-status=live }}] The completion of the section also allowed for full use of the New York State Thruway, which had been finished three years earlier but ended abruptly at the state line.[{{cite news |last=White |first=William A. |date=October 28, 1960 |title='Dead-End' Thruway Is Opened At Erie |page=4 |work=[The Pittsburgh Press](/source/The_Pittsburgh_Press) |url=https://www.newspapers.com/clip/89848466/dead-end-thruway-is-opened-at-erie/ |via=Newspapers.com |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201084456/https://www.newspapers.com/clip/89848466/dead-end-thruway-is-opened-at-erie/ |url-status=live }}]
I-90 would use several expressways and tollways in the Chicago area, the earliest of which was the [Tri-State Expressway](/source/Kingery_Expressway) (now the Kingery Expressway), completed in 1950 and extended into Indiana the following year.[{{cite news |last=Foust |first=Hal |date=October 23, 1950 |title=First Section of Expressway Will Open Nov. 1 |at=sec. 1, p. 14 |work=Chicago Tribune |url=https://www.newspapers.com/clip/90008367/first-section-of-expressway-will-open/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.newspapers.com/clip/90008367/first-section-of-expressway-will-open/ |url-status=live }}][{{cite news |date=December 14, 1951 |title=Schricker, Stevenson Open Super-Highway Link |page=1 |work=[The Hammond Times](/source/The_Hammond_Times) |url=https://www.newspapers.com/clip/90008620/schricker-stevenson-open-super-highway/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204085252/https://www.newspapers.com/clip/90008620/schricker-stevenson-open-super-highway/ |url-status=live }}] It was followed by the [Congress Expressway](/source/Eisenhower_Expressway) in the western suburbs, first opened in 1955, and the Northwest Tollway in 1958.[{{cite news |last=Foust |first=Hal |date=December 10, 1955 |title=Show 4.5 Mile Congress St. Stretch to Be Opened to Traffic Tuesday |at=sec. 1, p. 3 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89957155/show-45-mile-congress-st-stretch-to/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.newspapers.com/clip/89957155/show-45-mile-congress-st-stretch-to/ |url-status=live }}][{{cite news |date=August 21, 1958 |title=Traffic Rolls on 76 Miles of Tollways |at=sec. 1, p. 1 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89957220/traffic-rolls-on-76-miles-of-tollways/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203112636/https://www.newspapers.com/clip/89957220/traffic-rolls-on-76-miles-of-tollways/ |url-status=live }}] The last section to be completed in Illinois was the toll-free [Dan Ryan Expressway](/source/Dan_Ryan_Expressway), which opened on December 15, 1962, and was described as the "world's widest freeway" at the time.[{{cite news |last=Foust |first=Hal |date=December 16, 1962 |title=Drivers Jam Expressway on First Day |at=sec. 1, p. 1 |work=Chicago Tribune |url=https://www.newspapers.com/clip/90283091/drivers-jam-expressway-on-first-day/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 9, 2021 |archive-url=https://web.archive.org/web/20211209105701/https://www.newspapers.com/clip/90283091/drivers-jam-expressway-on-first-day/ |url-status=live }}][{{cite news |last=Sullivan |first=Mort J. |date=December 13, 1962 |title=Dan Ryan Expressway Will Open Saturday |page=24 |work=[Chicago Daily Herald](/source/Daily_Herald_(Arlington_Heights%2C_Illinois)) |agency=[United Press International](/source/United_Press_International) |url=https://www.newspapers.com/clip/90283107/dan-ryan-expressway-will-open-saturday/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 9, 2021 |archive-url=https://web.archive.org/web/20211209105659/https://www.newspapers.com/clip/90283107/dan-ryan-expressway-will-open-saturday/ |url-status=live }}] In 1965, the designation for I-90 was switched with I-94 south of Chicago, which moved it to the tolled Chicago Skyway (completed in 1958);[{{cite map |author=Rand McNally |year=1965 |title=1965 Illinois Official Highway Map |scale=1 inch = 12 miles |location=Springfield |publisher=[Illinois Division of Highways](/source/Illinois_Division_of_Highways) |url=https://apps.dot.illinois.gov/HistoricalMapViewer/Files/1965F_Illinois_Statemap.pdf |at=[https://apps.dot.illinois.gov/HistoricalMapViewer/Files/1965B_Illinois_Statemap.pdf Chicago and Vicinity] inset |access-date=December 9, 2021 |archive-date=November 7, 2021 |archive-url=https://web.archive.org/web/20211107232920/https://apps.dot.illinois.gov/HistoricalMapViewer/Files/1965F_Illinois_Statemap.pdf |url-status=live }}][{{cite news |last=Foust |first=Hal |date=April 17, 1958 |title=A Great Day For Chicago! Skyway Open |at=sec. 1, p. 1 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89957115/a-great-day-for-chicago-skyway-open/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233351/https://www.newspapers.com/clip/89957115/a-great-day-for-chicago-skyway-open/ |url-status=live }}] the change was requested by the Illinois and Indiana state governments to avoid confusion and provide a continuous toll connection to the Indiana Toll Road,[{{cite web |date=February 27, 1964 |title=An Application From the State Highway Department of Indiana For the Relocation of Interstate Route I-90 |publisher=American Association of State Highway Officials |url=https://grmservices.grmims.com/vsearch/portal/public/na4/aashto/default |via=AASHTO Route Numbering Archive |accessdate=December 9, 2021 |archive-date=October 2, 2020 |archive-url=https://web.archive.org/web/20201002030140/https://grmservices.grmims.com/vsearch/portal/public/na4/aashto/default |url-status=live }}] which had been fully opened in 1956.[{{cite news |date=November 16, 1956 |title=No Fanfare As Final Indiana Toll Link Opens; Semi-Trailer, State Police Car 1st Customers |page=1 |work=The Hammond Times |url=https://www.newspapers.com/clip/90008489/no-fanfare-as-final-indiana-toll-link/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204085317/https://www.newspapers.com/clip/90008489/no-fanfare-as-final-indiana-toll-link/ |url-status=live }}] I-90 was moved onto the Kennedy Expressway in 1977 and its western route was replaced with [I-290](/source/Interstate_290_(Illinois)) from Schaumburg to the [Circle Interchange](/source/Circle_Interchange) in Chicago.[{{AASHTO minutes |year=1977S |page=5 |accessdate=December 9, 2021}}][{{Illinois road map |year=1979 |inset=Chicago and Vicinity |accessdate=April 11, 2022}}]
The other tolled sections of I-90 were completed in the 1950s by their respective state governments. The {{convert|241|mi|km|adj=mid}} Ohio Turnpike opened to traffic on October 1, 1955, three years after construction began.[{{cite news |last=Cram |first=Winston |date=October 1, 1955 |title=Midnight Ceremony Opens Turnpike; Traffic Swarms On Ohio 'Main Street' |page=1 |work=[Toledo Blade](/source/Toledo_Blade) |url=https://news.google.com/newspapers?id=IvZOAAAAIBAJ&sjid=jwAEAAAAIBAJ&pg=6946%2C3406428 |via=[Google News Archive](/source/Google_News_Archive) |accessdate=December 9, 2021 |archive-date=December 9, 2021 |archive-url=https://web.archive.org/web/20211209113044/https://news.google.com/newspapers?id=IvZOAAAAIBAJ&sjid=jwAEAAAAIBAJ&pg=6946,3406428 |url-status=live }}] The first segment of the New York Thruway opened in June 1954 and was followed by extensions to Buffalo and the Albany area by the end of the year.[{{cite news |last=Ingraham |first=Joseph C. |date=June 23, 1954 |title=Thruway to Open Officially Today |page=29 |url=https://www.nytimes.com/1954/06/24/archives/thruway-to-open-officially-today-dewey-will-cut-tape-on-first-toll.html |work=The New York Times |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.nytimes.com/1954/06/24/archives/thruway-to-open-officially-today-dewey-will-cut-tape-on-first-toll.html |url-status=live }}][{{cite news |last=Ingraham |first=Joseph C. |date=October 24, 1954 |title=More Thruway: Newburgh-Utica Link Opens Tuesday, Bringing Pike Within 61 Miles of City |page=X19 |url=https://www.nytimes.com/1954/10/24/archives/more-thruway-newburghutica-link-opens-tuesday-bringing-pike-within.html |work=The New York Times |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204103347/https://www.nytimes.com/1954/10/24/archives/more-thruway-newburghutica-link-opens-tuesday-bringing-pike-within.html |url-status=live }}] It was extended to the Pennsylvania state line in 1957 and to the Massachusetts Turnpike via the Berkshire Connector in 1959.[{{cite news |date=December 15, 1957 |title=The Thruway Becomes the Longest Toll Road |page=159 |url=https://www.nytimes.com/1957/12/15/archives/the-thruway-becomes-the-longest-toll-road-on-schedule.html |work=The New York Times |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.nytimes.com/1957/12/15/archives/the-thruway-becomes-the-longest-toll-road-on-schedule.html |url-status=live }}][{{cite news |last=Weaver |first=Warren Jr. |date=May 27, 1959 |title=Thruway Opened to New England |page=20 |url=https://www.nytimes.com/1959/05/27/archives/thruway-opened-to-new-england-governor-rides-half-moon-in-symbolic.html |work=The New York Times |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204103847/https://www.nytimes.com/1959/05/27/archives/thruway-opened-to-new-england-governor-rides-half-moon-in-symbolic.html |url-status=live }}] The Berkshire section linked with the Massachusetts Turnpike, which had opened in 1957 from the state line to Newton, a distance of {{convert|123|mi|km}}.[{{cite news |last=Ingraham |first=Joseph C. |date=May 12, 1957 |title=Bay State's Turnpike Link |page=XX3 |url=https://www.nytimes.com/1957/05/12/archives/bay-states-turnpike-link-opening-of-massachusetts-highway-this-week.html |work=The New York Times |accessdate=December 4, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.nytimes.com/1957/05/12/archives/bay-states-turnpike-link-opening-of-massachusetts-highway-this-week.html |url-status=live }}] The turnpike was extended into Boston in two stages: first by {{convert|9|mi|km}} from Newton to [Allston](/source/Allston%2C_Boston) in September 1964;[{{cite news |last=Plotkin |first=A. S. |date=September 4, 1964 |title=Hot Debate Preceded Building of Toll Link |page=12 |work=The Boston Globe |url=https://www.newspapers.com/clip/90009720/hot-debate-preceded-building-of-toll/ |via=Newspapers.com |accessdate=December 4, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204110924/https://www.newspapers.com/clip/90009720/hot-debate-preceded-building-of-toll/ |url-status=live }}] and finally with an extension to I-93 near [South Station](/source/South_Station_(Boston)) in Downtown Boston that opened on February 18, 1965.[{{cite news |last=Hanron |first=Robert B. |date=February 19, 1965 |title=East-West Gateway Swings Open; 60 M.P.H. Through Boston... |page=1 |work=The Boston Globe |url=https://www.newspapers.com/clip/90009765/east-west-gateway-swings-open/ |via=Newspapers.com |accessdate=December 4, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204110924/https://www.newspapers.com/clip/90009765/east-west-gateway-swings-open/ |url-status=live }}]
===Non-tolled construction===
thumb|right|Construction sign on a section of I-90 in Montana|alt=Black-and-white photograph of a sign with the I-90 shield announcing "Interstate Highway Construction Next 12 Miles" with a recommended speed limit of 35 miles per hour.
The freeway also incorporated other non-tolled expressway bypasses planned by state governments in the early 1950s and modified to meet Interstate standards. A bypass of Spokane Valley, Washington, opened in November 1956 as the first section in Washington and was extended into neighboring Spokane two years later.[{{cite news |last=Dieffenbach |first=Al |date=November 16, 1961 |title=Freeway is Five: Traffic Benefits Are Listed |page=1 |work=[Spokane Daily Chronicle](/source/Spokane_Daily_Chronicle) |url=https://www.newspapers.com/clip/89848854/freeway-is-five-traffic-benefits-are/ |via=Newspapers.com |access-date=December 9, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201094407/https://www.newspapers.com/clip/89848854/freeway-is-five-traffic-benefits-are/ |url-status=live }}] Wisconsin opened their first section in November 1959, connecting the terminus of the Illinois Tollway with Janesville,[{{cite news |last=Foust |first=Hal |date=November 25, 1959 |title=Opens 18 Miles of Interstate Expressway |at=sec. 1, p. 8 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89956670/opens-18-miles-of-interstate-expressway/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203102613/https://www.newspapers.com/clip/89956670/opens-18-miles-of-interstate-expressway/ |url-status=live }}] and extended the freeway through the Madison area to Wisconsin Dells in 1962.[{{cite news |last=Foust |first=Hal |date=November 3, 1962 |title=Expressway From Chicago to Dells Open |at=sec. 1, p. 16 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89956704/expressway-from-chicago-to-dells-open/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203102847/https://www.newspapers.com/clip/89956704/expressway-from-chicago-to-dells-open/ |url-status=live }}] The Cleveland Innerbelt opened in stages from 1959 to 1962 and was originally planned to connect with the [Parma Freeway](/source/Parma_Freeway), which would have carried I-90 around the northwest side of [Downtown Cleveland](/source/Downtown_Cleveland). It was later cancelled in the 1960s amid [public opposition](/source/Freeway_revolt).[{{cite encyclopedia |date=May 11, 2018 |title=Innerbelt Freeway |url=https://case.edu/ech/articles/i/innerbelt-freeway |encyclopedia=[Encyclopedia of Cleveland History](/source/Encyclopedia_of_Cleveland_History) |publisher=[Case Western Reserve University](/source/Case_Western_Reserve_University) |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204093234/https://case.edu/ech/articles/i/innerbelt-freeway |url-status=live }}][{{cite news |last=Grant |first=Alison |date=May 6, 2015 |title=Big Creek bike-pedestrian greenway eyed for vicinity of abandoned 'Parma Freeway' |url=https://www.cleveland.com/metro/2015/05/big_creek_bike-pedestrian_gree.html |work=The Plain Dealer |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210033137/https://www.cleveland.com/metro/2015/05/big_creek_bike-pedestrian_gree.html |url-status=live }}] The first Minnesota section, built to bypass Austin, began construction in 1957 and opened in 1961.[{{cite news |date=October 2, 1957 |title=Road Construction Near Austin Part of East-West Belt Route |page=6B |work=The Minneapolis Star |url=https://www.newspapers.com/clip/90281922/road-construction-near-austin-part-of/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233353/https://www.newspapers.com/clip/90281922/road-construction-near-austin-part-of/ |url-status=live }}][{{cite news |date=November 9, 1961 |title=Beltline at Austin Opened |page=10 |work=[Winona Daily News](/source/Winona_Daily_News) |agency=Associated Press |url=https://www.newspapers.com/clip/89956300/beltline-at-austin-opened/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203092821/https://www.newspapers.com/clip/89956300/beltline-at-austin-opened/ |url-status=live }}]
[Wisconsin](/source/Wisconsin) was among the first states to complete its rural Interstate system and opened its final section of I-90, from La Crosse to Tomah, in November 1969.[{{cite news |date=October 22, 2009 |title=I-94 segment observes 50th anniversary |url=https://www.republicaneagle.com/news/i-94-segment-observes-50th-anniversary/article_c2b87d1b-b474-5d7c-b857-88f4ca6455ac.html |work=[Red Wing Republican Eagle](/source/Red_Wing_Republican_Eagle) |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233353/https://www.republicaneagle.com/news/i-94-segment-observes-50th-anniversary/article_c2b87d1b-b474-5d7c-b857-88f4ca6455ac.html |url-status=live }}][{{cite news |last=Wolski |first=Wayne |date=November 4, 1969 |title=I-90 Rites Open 4-Laner To Area |page=1 |work=La Crosse Tribune |url=https://www.newspapers.com/clip/89956768/i-90-rites-open-4-laner-to-area/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203102938/https://www.newspapers.com/clip/89956768/i-90-rites-open-4-laner-to-area/ |url-status=live }}] The section around Albany, New York, built as a toll-free alternative to the New York Thruway, was completed in 1976 with a connection to the Berkshire Connector, which had been originally intended to carry the I-90 designation across the Hudson River.[{{cite web |year=1977 |title=New York State Department of Transportation Annual Report, 1976 |page=7 |url=https://nysl.ptfs.com/data/Library1/Library1/pdf/1760149_1976.pdf |publisher=[New York State Department of Transportation](/source/New_York_State_Department_of_Transportation) |via=[New York State Library](/source/New_York_State_Library) |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233354/https://nysl.ptfs.com/aw-server/rest/product/purl/NYSL/s/ba9fa552-d3d2-4ebe-889d-367b1a1adfbb |url-status=live }}][{{cite news |last=O'Brien |first=Tim |date=March 25, 2010 |title=Thruway connector's name spurs question |url=http://blog.timesunion.com/gettingthere/thruway-connectors-name-spurs-question/697/ |work=Times Union |url-status=dead |archive-url=https://web.archive.org/web/20160213195904/http://blog.timesunion.com/gettingthere/thruway-connectors-name-spurs-question/697/ |archive-date=February 13, 2016 |accessdate=December 9, 2021}}] South Dakota completed its final section in November 1976, which created an unbroken stretch of four-lane highway from the Wyoming state line to Boston but some intersections remained.[{{cite news |date=November 19, 1976 |title=I-90 ceremony to be held near Spearfish |page=5 |work=[Mitchell Daily Republic](/source/Mitchell_Daily_Republic) |url=https://www.newspapers.com/clip/89956130/i-90-ceremony-to-be-held-near-spearfish/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203092825/https://www.newspapers.com/clip/89956130/i-90-ceremony-to-be-held-near-spearfish/ |url-status=live }}] The Minnesota segment of I-90 was declared complete in September 1978 with a dedication at Blue Earth, where a golden line was painted to emulate the [golden spike](/source/golden_spike) of the [first transcontinental railroad](/source/first_transcontinental_railroad).[{{cite news |last=Coleman |first=Nick |date=September 24, 1978 |title=Blue Earth puts Golden Spike in Interstate 90 |pages=[https://www.newspapers.com/clip/89956184/blue-earth-puts-golden-spike-in/ 1A], [https://www.newspapers.com/clip/89956211/blue-earth-puts-golden-spike-in/ 16A] |work=[Minneapolis Tribune](/source/Minneapolis_Tribune) |url=https://www.newspapers.com/clip/89956184/blue-earth-puts-golden-spike-in/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203092818/https://www.newspapers.com/clip/89956184/blue-earth-puts-golden-spike-in/ |url-status=live }}] Two months later, Ohio finished its last section west of Cleveland.[{{cite news |last=Hosie |first=Ron |date=November 4, 1978 |title=Heckler draws retort from Rhodes |page=3 |work=[Dayton Daily News](/source/Dayton_Daily_News) |url=https://www.newspapers.com/clip/90008915/heckler-draws-retort-from-rhodes/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233912/https://www.newspapers.com/clip/90008915/heckler-draws-retort-from-rhodes/ |url-status=live }}]
The western states were the last to complete their segments of I-90. Wyoming opened its final section, from the Montana state line to Sheridan, in July 1985 and dedicated it three months later following the completion of Montana's cross-border section.[{{cite news |last=Thackeray |first=Lorna |date=October 10, 1985 |title=Governors plan Interstate 90 christening |page=2B |work=[The Billings Gazette](/source/The_Billings_Gazette) |url=https://www.newspapers.com/clip/90333934/governors-plan-interstate-90-christening/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210064837/https://www.newspapers.com/clip/90333934/governors-plan-interstate-90-christening/ |url-status=live }}] The last two-lane section in Montana, near [Springdale](/source/Springdale%2C_Montana), was widened to four lanes in May 1987.[{{cite news |date=May 14, 1987 |title=I-90 finally done |page=9A |work=Great Falls Tribune |agency=Associated Press |url=https://www.newspapers.com/clip/89956022/i-90-finally-done/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233910/https://www.newspapers.com/clip/89956022/i-90-finally-done/ |url-status=live }}] One of the last rural sections of I-90 to be built was through [Wallace, Idaho](/source/Wallace%2C_Idaho), which placed its downtown on the [National Register of Historic Places](/source/National_Register_of_Historic_Places) in 1976 to prevent its demolition for the freeway. The {{convert|1.5|mi|km|adj=mid}} elevated freeway bypassed Wallace to the north and cost $42 million (equivalent to ${{Inflation|US-GDP|42|1991}} million in {{Inflation-year|US-GDP}} dollars){{inflation-fn|US-GDP}} to construct. It opened on September 5, 1991, and the city ceremonially retired the last [stoplight](/source/traffic_signal) on I-90 a week later.[{{cite news |last=Devlin |first=Sherry |date=September 8, 1991 |title=No Stopping Now |page=E1 |work=The Missoulian |url=https://www.newspapers.com/clip/90334418/no-stopping-now/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210064843/https://www.newspapers.com/clip/90334418/no-stopping-now/ |url-status=live }}][{{cite news |last=Free |first=Cathy |date=September 15, 1991 |title=Engineer pleased with his Wallace freeway 'work of art' |page=B3 |work=The Spokesman-Review |url=https://www.newspapers.com/clip/89735440/engineer-pleased-with-his-wallace/ |via=Newspapers.com |accessdate=November 28, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233910/https://www.newspapers.com/clip/89735440/engineer-pleased-with-his-wallace/ |url-status=live }}] The Idaho section was declared fully complete in July 1992 after the Veterans Memorial Centennial Bridge opened near Coeur d'Alene.[{{cite news |last=Foster |first=J. Todd |date=July 4, 1992 |title=New I-90 stretch offers scenery, safety |page=A1 |work=The Spokesman-Review |url=https://www.newspapers.com/clip/84197254/new-i-90-stretch-offers-scenery-safety/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210064835/https://www.newspapers.com/clip/84197254/new-i-90-stretch-offers-scenery-safety/ |url-status=live }}]
===Completion and later projects===
[[File:Interstate 90 floating bridges after Blue Angels performance - 01.jpg|thumb|right|The [Homer M. Hadley](/source/Homer_M._Hadley_Memorial_Bridge) (left) and [Lacey V. Murrow](/source/Lacey_V._Murrow_Memorial_Bridge) (right) floating bridges carry I-90 across [Lake Washington](/source/Lake_Washington) from [Seattle](/source/Seattle) to [Mercer Island](/source/Mercer_Island%2C_Washington).|alt=View of two bridges carrying a divided highway over a lake with light traffic]]
Washington was the last state to complete its section of I-90, primarily due to disputes and litigation over the Seattle–Bellevue section.[{{cite news |last=O'Ryan |first=John |date=December 4, 1981 |title=Cars whiz along on feared bridge |page=C1 |work=[Seattle Post-Intelligencer](/source/Seattle_Post-Intelligencer)}}] The viaduct replaced an earlier plan for a ground-level freeway at the behest of environmentalists; the [Mountains to Sound Greenway](/source/Mountains_to_Sound_Greenway) was established in 1990 along the corridor between Seattle and [Thorp](/source/Thorp%2C_Washington) to preserve wilderness and recreational areas and was designated as a National Scenic Byway in 1998, a first for an Interstate Highway.[{{cite news |last=Senos |first=Rene |date=April 18, 2002 |title=Blending scenery and ecology |url=https://www.djc.com/news/en/11132529.html |work=[Seattle Daily Journal of Commerce](/source/Seattle_Daily_Journal_of_Commerce) |accessdate=December 1, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233921/https://www.djc.com/news/en/11132529.html |url-status=live }}][{{cite web |last=Ott |first=Jennifer |date=May 18, 2021 |title=Mountains to Sound Greenway Trust |url=https://www.historylink.org/File/21231 |work=[HistoryLink](/source/HistoryLink) |accessdate=December 1, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233856/https://www.historylink.org/File/21231 |url-status=live }}] The extension into Seattle was completed in stages between 1989 and 1993 and cost $1.56 billion (equivalent to ${{format price|{{Inflation|US-GDP|1560000000|1993}}}} in {{Inflation-year|US-GDP}} dollars){{inflation-fn|US-GDP}} to construct.[{{cite news |last=Cabrera |first=Luis |date=September 11, 1993 |title=Floating bridge finishes interstate |page=5A |work=[Detroit Free Press](/source/Detroit_Free_Press) |agency=Associated Press |url=https://www.newspapers.com/clip/22449728/floating_bridge_finishes_interstate/ |via=Newspapers.com |access-date=August 2, 2018 |archive-url=https://web.archive.org/web/20180803074519/https://www.newspapers.com/clip/22449728/floating_bridge_finishes_interstate/ |archive-date=August 3, 2018 |url-status=live }}] The project involved construction of a [new floating bridge](/source/Homer_M._Hadley_Memorial_Bridge), expansion of the Mount Baker Ridge Tunnel, addition of [lids](/source/freeway_lid) with parks, and extensive mitigation for environmental and social impacts.[{{cite news |last=Corr |first=O. Casey |date=June 2, 1989 |title=The road to recovery—new homes, new park |page=A1 |work=Seattle Post-Intelligencer}}] The project was originally planned to be completed in 1992, but was delayed a year due to the sinking of the [original floating bridge](/source/Lacey_V._Murrow_Memorial_Bridge) during renovations in November 1990; the bridge was rebuilt and opened for eastbound traffic on September 12, 1993.[{{cite news |last=Gough |first=William |date=June 22, 1989 |title=That'll be one bridge—to go |page=A1 |work=The Seattle Times}}]
Extensions at both termini of I-90 were completed in the early 2000s as part of separate projects. The west end at Washington State Route 519 in Seattle was rebuilt as a series of ramps near [Safeco Field](/source/Safeco_Field) (now T-Mobile Park) to replace an existing intersection.[{{cite news |last=Lindblom |first=Mike |date=May 29, 2003 |title=Some I-90 drivers get turned around |page=A1 |work=The Seattle Times}}] A component of the [Big Dig](/source/Big_Dig) megaproject in Boston that extended I-90 east by {{convert|3.5|mi|km}} under Fort Point Channel and Boston Harbor to Logan International Airport opened on January 18, 2003,[{{cite news |last=Lewis |first=Raphael |date=January 18, 2003 |title=Pike tunnel finished, and new era begins |page=A1 |work=The Boston Globe |url=http://www.boston.com/dailyglobe2/018/metro/Pike_tunnel_finished_and_new_era_begins+.shtml |url-status=dead |archive-url=https://web.archive.org/web/20030124144148/http://www.boston.com/dailyglobe2/018/metro/Pike_tunnel_finished_and_new_era_begins+.shtml |archive-date=January 24, 2003 |accessdate=December 9, 2021}}] The Fort Point Channel tunnel later closed in July 2006 due to a [ceiling panel collapse](/source/Big_Dig_ceiling_collapse) that killed one person. It reopened in January 2007 after repairs and retrofit work.[{{cite news |last=Jefferson |first=Brandie M. |date=January 14, 2007 |title=Traffic begins flowing through Big Dig tunnel where woman died |url=http://archive.boston.com/news/local/massachusetts/articles/2007/01/14/traffic_begins_flowing_through_big_dig_tunnel_where_woman_died/ |work=The Boston Globe |agency=Associated Press |access-date=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210073558/http://archive.boston.com/news/local/massachusetts/articles/2007/01/14/traffic_begins_flowing_through_big_dig_tunnel_where_woman_died/ |url-status=dead }}]
Other sections of I-90 have been rebuilt or replaced to accommodate modern needs and meet updated safety standards. The {{convert|11|mi|km|adj=mid}} Dan Ryan Expressway in Chicago was reconstructed over a two-year period from 2006 to 2007 at a cost of $975 million (equivalent to ${{format price|{{Inflation|US-GDP|975000000|2007}}}} in {{Inflation-year|US-GDP}} dollars),{{inflation-fn|US-GDP}} adding auxiliary lanes and improved bridges. The section carried over 300,000 daily vehicles prior to the project.[{{cite news |last=Haggerty |first=Ryan |date=October 26, 2007 |title=All lanes will be open on the Dan Ryan |at=sec. 2, p. 2 |url=http://www.chicagotribune.com/news/local/chi-danryan_weboct26,0,7051621.story |work=Chicago Tribune |url-status=dead |archive-url=https://web.archive.org/web/20071227191626/http://www.chicagotribune.com/news/local/chi-danryan_weboct26,0,7051621.story |archive-date=December 27, 2007 |accessdate=December 10, 2021}}] Cleveland's [Innerbelt Bridge](/source/Innerbelt_Bridge), which carried I-90 over the Cuyahoga River, was replaced with the George V. Voinovich Bridges, which opened in November 2013 for westbound traffic and September 2016 for eastbound traffic.[{{cite news |last=Christ |first=Ginger |date=September 14, 2016 |title=Second George V. Voinovich Bridge (Inner Belt Bridge) opens to traffic Sept. 25 |url=https://www.cleveland.com/metro/2016/09/george_v_voinovich_bridge_inne.html |work=The Plain Dealer |accessdate=December 10, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210080002/https://www.cleveland.com/metro/2016/09/george_v_voinovich_bridge_inne.html |url-status=live }}] The old bridge was [imploded](/source/Building_implosion) with explosives on July 12, 2014, and dismantled by the end of the year.[{{cite news |last=Grant |first=Alison |date=July 12, 2014 |title=55-year-old Inner Belt Bridge vanishes in a half second |url=https://www.cleveland.com/metro/2014/07/55-year-old_inner_belt_bridge.html |work=The Plain Dealer |accessdate=December 10, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210080003/https://www.cleveland.com/metro/2014/07/55-year-old_inner_belt_bridge.html |url-status=live }}] The states of Minnesota and Wisconsin replaced the [Dresbach Bridge](/source/I-90_Mississippi_River_Bridge) over the Mississippi River in 2016; the project was spearheaded by Minnesota following the [I-35W Mississippi River bridge collapse](/source/I-35W_Mississippi_River_bridge) in 2007.[{{cite web |year=1991 |title=RCW 47.17.140: State route No. 90—American Veterans Memorial Highway—Washington green highway. |url=https://app.leg.wa.gov/rcw/default.aspx?cite=47.17.140 |work=[Revised Code of Washington](/source/Revised_Code_of_Washington) |publisher=[Washington State Legislature](/source/Washington_State_Legislature) |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082244/https://app.leg.wa.gov/rcw/default.aspx?cite=47.17.140 |url-status=live }}][{{cite map |author=MnDOT Office of Transportation System Management |date=October 17, 2019 |title=Memorial Highways & Bridges |url=https://www.dot.state.mn.us/maps/gdma/data/maps/memorial_routes.pdf |scale=Scale not given |location=St. Paul |publisher=Minnesota Department of Transportation |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201051409/https://www.dot.state.mn.us/maps/gdma/data/maps/memorial_routes.pdf |url-status=live }}] In the states of Idaho,[{{cite web |title=Idaho Statues 40-513C: Designation of Purple Heart Trail |year=2008 |url=https://legislature.idaho.gov/statutesrules/idstat/title40/t40ch5/sect40-513c/ |publisher=[Idaho Legislature](/source/Idaho_Legislature) |access-date=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082242/https://legislature.idaho.gov/statutesrules/idstat/title40/t40ch5/sect40-513c/ |url-status=live }}] Montana,[{{cite web |title=§ 60-1-210: Purple Heart Trail |url=https://leg.mt.gov/bills/2014/mca/60/1/60-1-210.htm |work=Montana Code Annotated 2014 |publisher=[Montana Legislature](/source/Montana_Legislature) |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201080644/https://leg.mt.gov/bills/2014/mca/60/1/60-1-210.htm |url-status=live }}] and South Dakota, I-90 is part of the [Purple Heart Trail](/source/Purple_Heart_Trail), which honors [Purple Heart](/source/Purple_Heart) recipients.[{{cite news |date=August 5, 2012 |title=Interstate 90 dedication set for 'Purple Heart Trail' |url=https://rapidcityjournal.com/news/local/communities/belle_fourche/interstate-90-dedication-set-for-purple-heart-trail/article_d13c6de5-a088-5057-974f-a7ee0b5fe60f.html |work=Rapid City Journal |url-access=subscription |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082244/https://rapidcityjournal.com/news/local/communities/belle_fourche/interstate-90-dedication-set-for-purple-heart-trail/article_d13c6de5-a088-5057-974f-a7ee0b5fe60f.html |url-status=live }}] In Wisconsin, I-90 and I-94 were designated as the Wisconsin Veterans Memorial Highway in 1987.[{{cite web |title=Commemorative highways and bridges |url=https://wisconsindot.gov/pages/travel/road/comm-hwys/default.aspx |publisher=Wisconsin Department of Transportation |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201051409/https://wisconsindot.gov/pages/travel/road/comm-hwys/default.aspx |url-status=live }}] From [Lorain, Ohio](/source/Lorain%2C_Ohio),[{{cite web |date=August 4, 1978 |title=Ohio Revised Code Section 5533.35: Amvets highway |url=https://codes.ohio.gov/assets/laws/revised-code/authenticated/55/5533/5533.35/8-4-1978/5533.35-8-4-1978.pdf |work=[Ohio Revised Code](/source/Ohio_Revised_Code) |publisher=[Ohio General Assembly](/source/Ohio_General_Assembly) |accessdate=December 1, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130181321/https://codes.ohio.gov/assets/laws/revised-code/authenticated/55/5533/5533.35/8-4-1978/5533.35-8-4-1978.pdf |url-status=live }}] through Pennsylvania and New York, I-90 is officially designated as the "AMVETS Memorial Highway".[{{cite web |date=July 11, 1990 |title=P.L. 453, No. 110: AMVETS Memorial Highway – Designation |url=https://www.legis.state.pa.us/cfdocs/legis/li/uconsCheck.cfm?yr=1990&sessInd=0&act=110 |work=[Pennsylvania Unconsolidated Statutes](/source/Pennsylvania_Consolidated_Statutes) |publisher=[Pennsylvania General Assembly](/source/Pennsylvania_General_Assembly) |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082246/https://www.legis.state.pa.us/cfdocs/legis/li/uconsCheck.cfm?yr=1990&sessInd=0&act=110 |url-status=live }}][{{cite news |date=May 9, 1991 |title=Thruway Ceremony Planned for May 17 |page=10 |work=[Hamburg Sun](/source/Hamburg_Sun) |url=https://www.newspapers.com/clip/89848246/thruway-ceremony-planned-for-may-17/ |via=Newspapers.com |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082241/https://www.newspapers.com/clip/89848246/thruway-ceremony-planned-for-may-17/ |url-status=live }}]
==Major intersections==
;Washington[{{cite map |year=2021 |title=Idaho Official State Highway Map |scale=1:1,248,000 |url=https://visitidaho.org/content/uploads/2021/05/Idaho_Highway_Map.pdf |location=Boise |publisher=Idaho Transportation Department |accessdate=April 11, 2022 |archive-date=April 18, 2022 |archive-url=https://web.archive.org/web/20220418193832/https://visitidaho.org/content/uploads/2021/05/ITC_HighwayMap-2021.pdf |url-status=live }}]
: {{jct|country=USA|US|95}} in [Coeur d'Alene](/source/Coeur_d'Alene%2C_Idaho)
;Montana[{{cite web |date=January 26, 2022 |title=Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2021 |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table02.cfm |work=Route Log and Finder List |publisher=Federal Highway Administration |accessdate=February 10, 2022 |archive-date=July 3, 2017 |archive-url=https://web.archive.org/web/20170703182115/https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table02.cfm |url-status=live }}]
* [Rapid City](/source/Rapid_City%2C_South_Dakota), South Dakota: [I-190](/source/Interstate_190_(South_Dakota))
* [Chicago](/source/Chicago), Illinois: [I-190](/source/Interstate_190_(Illinois)), [I-290](/source/Interstate_290_(Illinois))
* [Cleveland](/source/Cleveland), Ohio: [I-490](/source/Interstate_490_(Ohio))
* [Buffalo](/source/Buffalo%2C_New_York), New York: [I-190](/source/Interstate_190_(New_York)), [I-290](/source/Interstate_290_(New_York)), [I-990](/source/Interstate_990) (not directly connected)
* [Rochester](/source/Rochester%2C_Monroe_County%2C_New_York), New York: [I-390](/source/Interstate_390), [I-490](/source/Interstate_490_(New_York)), [I-590](/source/Interstate_590) (not directly connected)
* [Syracuse](/source/Syracuse%2C_New_York), New York: [I-690](/source/Interstate_690)
* [Utica](/source/Utica%2C_New_York), New York: [I-790](/source/Interstate_790)
* [Schenectady](/source/Schenectady%2C_New_York), New York: [I-890](/source/Interstate_890)
* [Worcester](/source/Worcester%2C_Massachusetts), Massachusetts: [I-190](/source/Interstate_190_(Massachusetts)) (not directly connected), [I-290](/source/Interstate_290_(Massachusetts))
I-90 in New York is the only Interstate Highway to have a complete set of auxiliary routes, all nine possible three-digit route numbers, within a single state.