Interstate 90
Seattle, WA | |
---|---|
| |
East end | ![]() ![]() Boston, MA |
Location | |
Country | United States |
States | Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts |
Highway system | |
Interstate 90 (I-90) is an east–west transcontinental
I-90 begins at Washington State Route 519 in Seattle and crosses the Cascade Range in Washington and the Rocky Mountains in Montana. It then traverses the northern Great Plains and travels southeast through Wisconsin and the Chicago area by following the southern shore of Lake Michigan. The freeway continues across Indiana and follows the shore of Lake Erie through Ohio and Pennsylvania to Buffalo. I-90 travels across New York by roughly following the historic Erie Canal and traverses Massachusetts, reaching its eastern terminus at Massachusetts Route 1A near Logan International Airport in Boston.
The freeway was established by the Federal-Aid Highway Act of 1956, replacing a series of existing U.S. highways that had been preceded by local roads and auto trails established in the early 20th century. I-90 was numbered in 1957, reflecting its status as the northernmost transcontinental route of the system, and construction was underway on several sections with funding from the Federal-Aid Highway Act.
The route also incorporates several
Route description
mi[1] | km
| |
---|---|---|
WA | 296.92 | 477.85 |
ID | 73.55 | 118.37 |
MT | 552.46 | 889.10 |
WY | 208.80 | 336.03 |
SD | 412.76 | 664.27 |
MN | 275.70 | 443.70 |
WI | 187.13[2] | 301.16 |
IL | 123.89 | 199.38 |
IN
|
156.28 | 251.51 |
OH | 244.75 | 393.89 |
PA | 46.30 | 74.51 |
NY | 385.48 | 620.37 |
MA
|
135.72 | 218.42 |
Total | 3,099.74 | 4,988.55 |
I-90 is the longest
According to 2011 data from the Federal Highway Administration, the busiest section of I-90 is in the Chicago area, where a daily average 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.[6]
Washington

The western terminus of I-90 is at an intersection with
The floating bridges cross Lake Washington to Mercer Island, where I-90 travels through a series of tunnels under 14 acres (5.7 ha) of parkland, including Aubrey Davis Park.[11][12] The freeway continues from the island and enters Bellevue, the largest city of the Eastside region, and intersects I-405 near Factoria. I-90 then travels along Lake Sammamish and through Issaquah as it leaves the Seattle metropolitan area and ascends into the Cascade Range on the Mountains to Sound Greenway, a designated National Heritage Area and National Scenic Byway.[13] The freeway crosses Snoqualmie Pass, elevation 3,022 feet (921 m), at the crest of the mountain range near a ski resort.[14]
From Snoqualmie Pass, I-90 follows the
Idaho

I-90 traverses the
The freeway continues east across Fourth of July Summit and descends into the Silver Valley, where it follows the Coeur d'Alene River through several small towns along the historic Mullan Road. I-90 serves the cities of Kellogg and Wallace before it ascends into the Bitterroot Range and crosses Lookout Pass, which also marks the Montana state line.[4]
Montana

Montana has the longest section of I-90, at almost 552 miles (888 km), despite the highway only serving a portion of the state's east–west width.[1][17] It descends from Lookout Pass along the St. Regis and Clark Fork rivers between the foothills of the Bitteroot Range and Coeur d'Alene Mountains. The freeway travels east through the Alberton Gorge and crosses the Clark Fork River several times before it reaches the head of the Missoula Valley.[18] After a short concurrency with US 93, I-90 runs along the north side of Missoula and joins US 12 to continue southeast along the foothills of the Garnet Range and Sapphire Mountains.[17]
After it splits from US 12 in
I-90 travels around
From 1995 to 1999, there was no numbered daytime speed limit on rural highways in Montana, including I-90.[22] The speed limit was simply defined as "reasonable and proper" as determined on a case-by-case basis by the Montana Highway Patrol until the Montana Supreme Court ruled it was unconstitutional.[23] The maximum daytime speed limit in Montana was initially set at 75 mph (120 km/h) in 1999 and was later raised to 80 mph (130 km/h) in 2015.[24]
Wyoming
I-90 serves a portion of northeastern Wyoming that is primarily rural.
From Buffalo, the highway turns east to cross the Powder River Basin, a region with several large coal mines.[27] I-90 then reaches Gillette, where it begins a concurrency with US 14 and US 16 to a three-way split in Moorcroft. The freeway continues into the Bear Lodge Mountains (part of the Black Hills) and is rejoined in Sundance by US 14, which looped north to serve the Devils Tower.[28] I-90/US 14 then continues northeast to Beulah, where it enters South Dakota.[26]
South Dakota

I-90/US 14 enters South Dakota near Spearfish and travels east through prairie land, where it is briefly concurrent with US 85. Beyond Sturgis, the freeway turns south and follows the edge of the Black Hills to Rapid City, the gateway to Mount Rushmore.[29] It then skirts the northern edge of Rapid City, which is served by spur route I-190, and passes Ellsworth Air Force Base while it continues east across the plains. I-90 splits from US 14 near Wall, home to the Wall Drug roadside attraction and located northeast of Badlands National Park.[30][31]
The freeway travels southeast into the
Minnesota
I-90 crosses the southern portion of Minnesota and carries unsigned Legislative Route 391 across the state.[35] From the South Dakota border near Beaver Creek to Albert Lea, the freeway travels east across farmland and towns in the plains and rolling hills of the Buffalo Ridge. It also intersects several north–south highways, including US 75 in Luverne, US 59 in Worthington, US 71 in Jackson, and US 169 in Blue Earth. I-90 travels around the northern outskirts of Albert Lea and intersects I-35 northeast of the city. It then reaches Austin and a brief concurrency with US 218.[36]
From Austin, the freeway turns northeast to head towards
Wisconsin

I-90 enters Wisconsin near
The freeway travels east from Wisconsin Dells to the Portage area, where I-39 begins its concurrency with I-90/I-94. The highway then crosses the Wisconsin River and travels south towards Madison, 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 and Janesville. The highway turns south and enters Beloit, where it intersects I-43 and crosses into Illinois.[40]
Illinois

I-90 uses several sections of the
The tollway cuts through the northwestern suburbs of Chicago, where it intersects I-290 in Schaumburg and passes the north side of O'Hare International Airport. On the east side of the airport in Rosemont, I-90 intersects I-294 and I-190, the latter of which serves the airport's passenger terminals and marks the end of the tollway.[41] The freeway, now named the Kennedy Expressway, travels through northwestern Chicago, where the Blue Line of the "L" rapid transit system runs in the median and serves several stops.[42] I-90 turns southeast and is rejoined by I-94 in Irving Park, where it gains a set of reversible express lanes that travel for 6.2 miles (10.0 km) toward the Near West Side.[43]
The Kennedy Expressway travels south through the Near West Side, opposite the
Indiana

The entirety of I-90 within Indiana is concurrent with the Indiana Toll Road, which crosses the state's northern fringe and is mostly shared with I-80.[48] From the Illinois state line, the tollway travels south through Hammond and turns east to follow the Grand Calumet River through northern Gary, where it intersects US 41 and US 12. I-90 then crosses I-65 in eastern Gary and I-94 in Lake Station, where it begins a concurrency with I-80.[48]
I-94 travels northeast near the Lake Michigan shoreline from Lake Station to Michigan City, while the Indiana Toll Road (I-80/I-90) follows it to the south. The tollway then moves closer to the Michigan–Indiana state line and turns east, passing through the northern outskirts of South Bend and Elkhart. In South Bend, it intersects US 31 and passes near the University of Notre Dame. I-80/I-90 travels parallel to the state line until it reaches an interchange with I-69 near Fremont, where it turns southeast. The tollway then turns east and crosses the Ohio state line near Angola.[48]
Ohio

At the state line near Montpelier, I-80/I-90 transitions from the Indiana Toll Road to the Ohio Turnpike, which crosses northern Ohio. The highway continues east around several rural towns as it approaches the Toledo area. The turnpike crosses under I-475 in Maumee without an interchange; access to I-475 is instead provided through a nearby junction with US 20. I-80/I-90 then continues southeast across the Maumee River to Rossford on the southern outskirts of Toledo, where it intersects I-75.[49]
The turnpike travels southeast through a rural area near the southwest shore of
From Tremont, I-90 turns north onto the
Pennsylvania
Within Pennsylvania, I-90 is non-tolled and generally travels northeast around several communities on the Lake Erie shoreline and remains entirely in Erie County.[52] It enters the state in Springfield Township and passes through rural areas along the lake shore, parallel to US 20 and the Lake Road. The freeway then travels through the southern outskirts of Erie, where it intersects I-79 and US 19. I-90 returns to the rural areas of northeastern Erie County and intersects I-86 before it reaches the New York state line near the borough of North East.[52] At 46 miles (74 km), the Pennsylvania section is I-90's shortest within a single state.[3]
New York

I-90 enters New York in
The Thruway passes south of
I-90 then closely follows the Mohawk River southeast through several towns and villages between the foothills of the
The
Massachusetts

I-90 in Massachusetts is concurrent with the entirety of the Massachusetts Turnpike (also known as "the Pike" or "MassPike").[61] The turnpike begins at the New York state line in West Stockbridge and travels southeast through the Berkshires to the Pioneer Valley.[62] The highway travels through the northern suburbs of Springfield, where it intersects I-91 and crosses the Connecticut River into Chicopee. I-90 then crosses over I-391 without an interchange and serves as the northern terminus of I-291 on the eastern outskirts of the city. The turnpike continues east through the hills of Central Massachusetts and serves as the eastern terminus of I-84 in the town of Sturbridge.[61]
From Sturbridge, the turnpike travels northeast towards Worcester and passes through the city's southern outskirts. It serves as the respective northern and western terminus of I-395 and I-290 in Auburn, located southwest of Worcester, and continues to an interchange with I-495 near Westborough at the edge of Greater Boston. I-90 travels through the western suburbs of Boston and travels through Framingham before it intersects I-95/Route 128, the main beltway around Boston, on the border of Weston and Newton.[61] The turnpike continues along the Charles River into Boston, where it descends into a tunnel that passes Boston University, Fenway Park, and under the Prudential Tower complex in the Back Bay neighborhood.[4][63]
I-90 intersects I-93 on the south side of Downtown Boston and travels under the Fort Point Channel to serve the Seaport District. The turnpike then enters the Ted Williams Tunnel, which travels northeast under Boston Harbor to the passenger terminals at Logan International Airport.[64] After it passes the northwest side of the airport, I-90 terminates at an interchange with Route 1A in East Boston.[61] The section between I-93 and the airport was opened in the early 2000s as part of the Big Dig megaproject,[64] which rebuilt several Boston freeways and extended I-90 by 3.5 miles (5.6 km).[3][65]
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
The freeway would travel along existing parts of the
Tollways and urban construction
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
I-90 would use several expressways and tollways in the Chicago area, the earliest of which was the
The other tolled sections of I-90 were completed in the 1950s by their respective state governments. The 241-mile (388 km) Ohio Turnpike opened to traffic on October 1, 1955, three years after construction began.
Non-tolled construction

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.
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.[108][109] 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.[110][111] 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.[112] 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 of the first transcontinental railroad.[113] Two months later, Ohio finished its last section west of Cleveland.[114]
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.
Completion and later projects

Washington was the last state to complete its section of I-90, primarily due to disputes and litigation over the Seattle–Bellevue section.[11] The Snoqualmie Pass section was completed in 1981 with a viaduct for westbound traffic that stands 150 feet (46 m) over Denny Creek.[121] The viaduct replaced an earlier plan for a ground-level freeway at the behest of environmentalists; the Mountains to Sound Greenway was established in 1990 along the corridor between Seattle and Thorp to preserve wilderness and recreational areas and was designated as a National Scenic Byway in 1998, a first for an Interstate Highway.[122][123] The extension into Seattle was completed in stages between 1989 and 1993 and cost $1.56 billion (equivalent to $2.97 billion in 2023 dollars)[117] to construct.[124] The project involved construction of a new floating bridge, expansion of the Mount Baker Ridge Tunnel, addition of lids with parks, and extensive mitigation for environmental and social impacts.[11][125] The project was originally planned to be completed in 1992, but was delayed a year due to the sinking of the original floating bridge during renovations in November 1990; the bridge was rebuilt and opened for eastbound traffic on September 12, 1993.[11][126]
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
Other sections of I-90 have been rebuilt or replaced to accommodate modern needs and meet updated safety standards. The 11-mile (18 km) Dan Ryan Expressway in Chicago was reconstructed over a two-year period from 2006 to 2007 at a cost of $975 million (equivalent to $1.38 billion in 2023 dollars),[117] adding auxiliary lanes and improved bridges. The section carried over 300,000 daily vehicles prior to the project.[130] Cleveland's 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.[131] The old bridge was imploded with explosives on July 12, 2014, and dismantled by the end of the year.[132] The states of Minnesota and Wisconsin replaced the Dresbach Bridge over the Mississippi River in 2016; the project was spearheaded by Minnesota following the I-35W Mississippi River bridge collapse in 2007.[38]
Names and designations

I-90 carries several commemorative names designated by state governments, some of which are shared between multiple states.[4] Washington and Minnesota designated their sections as the "American Veterans Memorial Highway".[133][134] In the states of Idaho,[135] Montana,[136] and South Dakota, I-90 is part of the Purple Heart Trail, which honors Purple Heart recipients.[137] In Wisconsin, I-90 and I-94 were designated as the Wisconsin Veterans Memorial Highway in 1987.[138] From Lorain, Ohio,[139] through Pennsylvania and New York, I-90 is officially designated as the "AMVETS Memorial Highway".[140][141]
Major intersections
- Washington[10]
SR 519 in downtown Seattle
I-5 in downtown Seattle
I-405 in Bellevue near Seattle
I-82 / US 97 in Ellensburg
US 395 in Ritzville; joined for 61 miles (98 km) until Spokane
US 2 / US 395 in Spokane; joined for 4 miles (6.4 km)
- Idaho[142]
US 95 in Coeur d'Alene
- Montana[17]
US 93 near Missoula; joined for 5 miles (8.0 km)
US 12 in Missoula; joined for 69 miles (111 km) until Garrison
I-15 near Butte; joined for 8 miles (13 km) through Butte
I-115 in Butte
US 191 in Bozeman; joined for 58 miles (93 km) until Big Timber
US 89 in Livingston; joined for 7 miles (11 km)
US 212 in Laurel; joined for 77 miles (124 km) until Crow Agency
US 87 in Billings; joined for 128 miles (206 km) until Sheridan, Wyoming
I-94 near Billings
- Wyoming[26]
US 14 in Ranchester; joined for 16 miles (26 km) until Sheridan
US 87 near Buffalo; joined for 12 miles (19 km)
I-25 in Buffalo
US 14 / US 16 in Gillette; joined for 25 miles (40 km) until Moorcroft
US 14 in Sundance; joined for 132 miles (212 km) until Wall, South Dakota
- South Dakota[31]
US 85 in Spearfish; joined for 8 miles (13 km)
I-190 / US 16 in Rapid City
US 83 in Murdo; joined for 22 miles (35 km) until Vivian
US 183 in Presho
US 281 near Plankinton
I-29 in Sioux Falls
I-229 in Sioux Falls
- Minnesota[36]
US 75 in Luverne
US 59 in Worthington
US 71 in Jackson
US 169 in Blue Earth
I-35 in Albert Lea
US 218 in Austin; joined for 3 miles (4.8 km)
US 63 in Stewartville
US 52 in Rochester
US 14 / US 61 in Dakota; joined for 5 miles (8.0 km) until La Crescent
- Wisconsin[40]
US 53 in La Crosse; joined for 2 miles (3.2 km) until Onalaska
US 12 in Tomah, Lyndon, and Delton
I-94 in Tomah; joined for 92 miles (148 km) until Madison
I-39 in Portage; joined for 95 miles (153 km) until Cherry Valley, Illinois
US 51 in Burke
US 151 in Madison
US 12 / US 18 in Madison
US 51 in Christiana; joined for 4 miles (6.4 km) until Albion
I-43 in Beloit
- Illinois[41]
US 51 in South Beloit; joined for 17 miles (27 km) until Rockford
US 20 in Hampshire
I-290 in Schaumburg
- I-294 in Rosemontnear Chicago
I-190 to O'Hare International Airport near Chicago
I-94 in Chicago; joined for 17 miles (27 km)
I-290 in downtown Chicago
I-55 in downtown Chicago
US 12 / US 20 / US 41 near Chicago
- Indiana[48]
US 41 in Hammond
US 12 in Gary
I-65 / US 12 / US 20 in Gary
I-94 / US 6 in Lake Station
I-80 in Lake Station; joined for 278 miles (447 km) until Elyria, Ohio
US 421 in New Durham Township
US 31 in South Bend
US 131 in York Township
I-69 in Fremont
- Ohio[49]
US 20 in Maumee
I-75 in Rossford near Toledo
I-280 in Lake Township
US 250 near Milan
US 42 in Cleveland
I-71 in Cleveland
I-490 in Cleveland
US 422 in downtown Cleveland
I-77 in downtown Cleveland
US 322 in downtown Cleveland
US 6 in downtown Cleveland
US 20 in Euclid
I-271 in Willoughby Hills near Cleveland
- Pennsylvania[52]
US 6N in Springfield Township
I-79 near Erie
US 19 near Erie
- I-86near Erie
US 20 near North East
- New York[53]
US 20 in Hanover
US 219 in West Seneca
I-190 in Buffalo
I-290 in Williamsville near Buffalo
I-490 near Bergen
- I-390 near Rochester
I-490 near Victor
- I-690 near Syracuse
I-81 in Syracuse
- I-481near Syracuse
- I-790 in Utica
- I-890 near Schenectady
- I-88 in Rotterdam
- I-890near Schenectady
I-87 in Albany
US 9 in downtown Albany
- I-787in downtown Albany
US 4 in East Greenbush
US 9 / US 20 in Schodack
- Massachusetts[61]
US 20 in Lee
US 202 in Westfield
I-91 / US 5 in West Springfield
I-291 in Chicopee near Springfield
- I-84 in Sturbridge
Route 146 in Millbury
I-495 in Hopkinton
I-95 in Weston
I-93 in Boston
Route 1A/Logan International Airport in Boston
Auxiliary routes
- Source: FHWA[143]
- Rapid City, South Dakota: I-190
- Chicago, Illinois: I-190, I-290
- Cleveland, Ohio: I-490
- Buffalo, New York: I-190, I-290, I-990 (not directly connected)
- (not directly connected)
- Syracuse, New York: I-690
- Utica, New York: I-790
- Schenectady, New York: I-890
- Worcester, Massachusetts: I-190 (not directly connected), I-290
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.[3] Eight of the thirteen states that the highway passes through do not have auxiliary routes of I-90.[3]
See also
References
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External links
Geographic data related to Interstate 90 at OpenStreetMap
- I-90 at Interstate-Guide.com