Interstate 90

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Interstate 90 Main route of the Interstate Highway System
Length:	3099 mi (4987 km)
Formed:	1957
West end:	SR 519 in Seattle, WA
Major junctions:	I-5 in Seattle, WA I-15 near Butte, MT I-25 near Buffalo, WY I-35 near Albert Lea, MN I-55 in Chicago, IL I-65 in Gary, IN I-75 near Toledo, OH I-87 in Albany, NY I-95 in Weston, MA
East end:	Route 1A in Boston, MA
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Interstate 90 (abbreviated I-90) is the longest interstate highway in the United States at nearly 3,100 miles (5,000 kilometers). It is the northernmost east-to-west, coast-to-coast interstate. Its western terminus is in Seattle, Washington at 4th Avenue S. next to Qwest Field, and its eastern terminus is in Boston, Massachusetts at Route 1A near Logan International Airport. It crosses the Continental Divide just east of Butte, Montana.

From the Wisconsin/Illinois border east, the majority of I-90 is tolled, along the following toll roads (several of which predate the Interstate system): the Northwest Tollway, Chicago Skyway, Indiana Toll Road, Ohio Turnpike, New York State Thruway, and the Massachusetts Turnpike, including the Ted Williams Tunnel. It is free through northeastern Ohio and Pennsylvania, and through brief sections near Buffalo and Albany, New York.

Contents 1 History 2 Route description 2.1 Washington 2.2 Idaho 2.3 Montana 2.4 Wyoming 2.5 South Dakota 2.6 Minnesota 2.7 Wisconsin 2.8 Illinois 2.9 Indiana 2.10 Ohio 2.11 Pennsylvania 2.12 New York 2.12.1 New York Law Defining Route 2.13 Massachusetts 3 Major Intersections 4 Spur routes 5 References 6 External links

[edit] History

I-90 made heavy use of existing roads. The Massachusetts Turnpike, New York State Thruway, Ohio Turnpike, Indiana Toll Road, Chicago Skyway, and Northwest Tollway all predate I-90 and were used for parts of its route. This also means that substantial portions of the route are not precisely to interstate standards, but they are usually close.

[edit] Route description

Major cities Bolded cities are officially-designated control cities for signs.

Seattle, Washington Ellensburg, Washington Spokane, Washington Coeur d'Alene, Idaho Missoula, Montana Butte, Montana Bozeman, Montana Billings, Montana Sheridan, Wyoming Gillette, Wyoming Rapid City, South Dakota Sioux Falls, South Dakota Albert Lea, Minnesota La Crosse, Wisconsin Wisconsin Dells, Wisconsin Madison, Wisconsin Janesville, Wisconsin Beloit, Wisconsin Rockford, Illinois Chicago, Illinois Gary, Indiana South Bend, Indiana Toledo, Ohio Cleveland, Ohio Erie, Pennsylvania Buffalo, New York Rochester, New York (bypassed) Syracuse, New York Utica, New York Schenectady, New York Albany, New York Pittsfield, Massachusetts (bypassed) Springfield, Massachusetts (bypassed) Worcester, Massachusetts (bypassed) Boston, Massachusetts

Miles	km	state
296.92	477.85	Washington
73.55	118.37	Idaho
551.68	887.84	Montana
208.8	336.03	Wyoming
412.76	664.27	South Dakota
275.7	443.70	Minnesota
187.14	301.84	Wisconsin
123.89	199.38	Illinois
156.28	251.51	Indiana
244.75	393.89	Ohio
46.4	74.67	Pennsylvania
385.48	620.37	New York
135.72	218.42	Massachusetts
3,099.07	4958.51	Total[1]

[edit] Washington

In 2003, the Seattle terminus was re-engineered to better accommodate traffic from the two nearby sports stadiums. I-90 westbound still ends at its previous location next to Qwest Field, but eastbound begins about 1/4 mile (0.4 km) south at Edgar Martinez Dr. near the roof shed of Safeco Field at an interchange with 4th Avenue S.

I-90 incorporates two of the longest floating bridges in the world, the Lacey V. Murrow Memorial Bridge and the Homer M. Hadley Memorial Bridge, which cross Lake Washington from Seattle to Mercer Island, Washington. They are the second and fifth longest such bridges, respectively.

Since 1980, I-90 from Seattle to Thorp, WA, was designated the Mountains To Sound Greenway to protect its outstanding scenic and cultural resources.^[2]

Washington Law Defining Route

The Washington section of I-90 is defined at Washington Revised Code § 47-17-140.[1]

[edit] Idaho

The small town of Wallace, Idaho still prides itself on having what was the last stop light on I-90. Its downtown has many historical buildings, which would have been wiped out by the original planned route of the freeway, so in 1976, city leaders had the downtown placed on the National Register of Historic Places. As a result, the federal government was forced at great expense to reroute the freeway to the northern edge of downtown and elevate it. That section of I-90 opened in September 1991. A bicycle path is routed beneath part of that segment.

[edit] Montana

Until 1995 in Montana near the Idaho border, I-90 was not a divided highway for a few stretches, having only a narrow paved median. From 1995 until 1999, the speed limit in Montana was "reasonable and prudent"; it is now 75 mph (120 km/h).

[edit] Wyoming

At the Montana border I-90 is a four lane divided highway with a grass median. At Buffalo, Wyoming (if travelling eastward from the north) it diverges from I-25 with a more east west orientation.

[edit] South Dakota

Near Sturgis, South Dakota at the Wyoming border I-90 is a four lane divided highway with a grass meridian. In the Sioux Falls area, I-90 intersects I-29 and continues east west a short distance to Minnesota.

South Dakota Law Defining Route

The South Dakota section of I-90 is defined at South Dakota Codified Laws § 31-4-184.[2]

[edit] Minnesota

I-90 crosses southern Minnesota from the South Dakota border near Sioux Falls to the Mississippi River near LaCrosse, Wisconsin. On most of its length in the state, it is close to the Iowa border and fairly parallel with it. In southeast Minnesota, it curves north to Rochester.

Minnesota Law Defining Route

The Minnesota section of I-90 is defined as Route 391 in Minnesota Statutes § 161.12(3).[3]

[edit] Wisconsin

Main article: Interstate 90 in Wisconsin

I-90 crosses Wisconsin from Minnesota to Illinois in a generally southeasterly direction. It joins I-94 in Tomah and I-39 in Portage. I-94 separates from I-90 at Madison.

I-39/90/94 from just south of Portage to Madison is the longest concurrency of three interstate highways in the United States.

[edit] Illinois

Main article: Interstate 90 in Illinois

See also: Northwest Tollway, Kennedy Expressway, Dan Ryan Expressway, and Chicago Skyway

In the state of Illinois, Interstate 90 enters Illinois north of Rockford oriented north-south joined with Interstate 39. It then runs east-southeast directly to the city of Chicago. From Rockford to Interstate 294 the road is tolled and called the Northwest Tollway. In Chicagoland, I-90 is known by three names from O'Hare International Airport to the Indiana state line. The Kennedy Expressway runs from O'Hare to Interstate 290 and the Chicago Loop. I-90 continues running south of the Loop on part of the Dan Ryan Expressway, and then southeast onto the tolled Chicago Skyway into Indiana.

[edit] Indiana

Main article: Indiana Toll Road

In the state of Indiana, Interstate 90 enters from Illinois at the Chicago Skyway. It then runs to the concurrency of Interstates 80/94 east of Interstate 65, where I-80 leaves I-94 and joins with I-90. The combined I-80/90 route runs east across northern Indiana and near the southern border of Michigan to the Ohio state line.

As part of the Toll Road, I-80/90 passes to the north of South Bend and Elkhart. It also passes north of Angola at Interstate 69.

[edit] Ohio

See also: Ohio Turnpike

The Indiana Toll Road turns into the Ohio Turnpike as it crosses the border. I-90 follows the Ohio Turnpike until Elyria (west of Cleveland), where it turns north to follow a route near the shores of Lake Erie.

In Cleveland, Interstate 90 serves as the Innerbelt at the confluence of the northern termini of Interstates 71 and 77. One of the most peculiar and hazardous stretches of Interstate 90 is the section of highway passing through downtown, known locally as Dead Man's Curve. Here, the road takes a nearly 90-degree turn (Google Maps satellite view). While there are plenty of large signs and flashing lights alerting motorists to this turn, there have still been a large number of accidents due to inattentive motorists. There are plans to realign the freeway along a shallower curve within the next decade, as part of a larger project to improve the highway system in Cleveland.^[3]

[edit] Pennsylvania

I-90 goes from the Ohio state line through Erie, Pennsylvania, and then leaves Pennyslvania for New York.

While not an interstate, a portion of Pennsylvania Route 5 in Erie has recently been named Pennsylvania Route 290. The purpose is to encourage travelers to use this stretch of Erie's 12th Street as a loop, connecting Interstate 79 and 90 to the Bayfront Connector and downtown Erie.

[edit] New York

See also: New York State Thruway

I-90 becomes the New York State Thruway upon entering New York. It follows the Lake Erie coast until Buffalo, where it joins the old Water Level Route until Albany. There, it takes a short detour before joining the New York State Thruway Berkshire Connector.

Almost all of the New York portion of the road is a toll road, comprising the east-west portion of the New York State Thruway mainline and part of the Berkshire Connector, operated by the New York State Thruway Authority. It was originally constructed as part of the Thruway project in the middle 1950s and received its current designation as Interstate 90 in 1958. "I-90" (operated by NYSDOT) carries Interstate 90 between the two; however, the Berkshire Section directly connects to the mainline (at Thruway interchange 21A) 6.5 miles (10.5 km) west of the point where I-90 joins it (at Thruway interchange B1).

The mileposts and exit numbers on the New York State Thruway mainline originate at the New York City line and increase northward along Interstate 87 and westward along Interstate 90. As a result, mileposts and exit numbers on the I-90 section of the Thruway mainline increase from east to west, contrary to modern practices where numbers increase from the west or south. The NYSDOT-maintained portion in between, known to locals as "Freebie 90," does number its mileage and exits in the traditional west-to-east method. It starts over again when the Berkshire Section of the Thruway begins, with exit and mile numbers preceded by the letter B (Exit B1, Exit B2, Mile B1, Mile B2, and so on).

There once were two metric-only signs on the westbound New York State Thruway around Syracuse, which is about 100 miles (161 km) from Canada. The NYS Thruway Authority decided to test metric signage, which may have included (briefly) an 88 km/h speed limit sign, on the Thruway. There was also a sign displaying the distance to the Interstate 81 interchange in kilometers in Dewitt. These signs are now displayed in just miles.

I-90 is the only Interstate having a complete set of nine spur routes (190, 290, 390...890, 990) within one state, which is in New York. (Interstate 80 has a complete set in different states.) In addition, I-990, a short spur route near Buffalo, New York not directly connected to I-90, is the highest number given to an Interstate.

I-790 in Utica used to have a completely direct connection with the I-90 at Thruway interchange 31. Various road redesign projects over the years have eventually lead to this direct connection being partially severed. Traffic exiting the Thruway must use two different surface streets to reach I-790. However, it is still possible to travel from I-790 directly onto the Thruway. I-790 has some other oddities: no exit numbers, no reassurance markers, and it runs concurrent with New York State Route 5 for its entire length.

[edit] New York Law Defining Route

The New York section of I-90 west of the Berkshire section of the New York Thruway is defined as Interstate Route 504 in New York Highway Law § 340-a.[4]

[edit] Massachusetts

I-90 in Massachusetts runs along the pre-Interstate era Massachusetts Turnpike.

I-90 originally ended at I-93 in Boston until it was connected via the Ted Williams Tunnel in January 2003 (as part of the Big Dig) to Boston's Logan International Airport. This extended I-90 by an additional 1.3 miles (2.1 km), shifting the eastern terminus to Route 1A.

Turnpike Doubles are permitted to travel between exit 11 and through the New York state border.

[edit] Major Intersections

• Interstate 5 in Seattle, Washington
• Interstate 405 in Bellevue, Washington
• Interstate 82 in Ellensburg, Washington
• Interstate 15 in Butte, Montana; joined for 7.65 miles (12.31 km)
• Interstate 94 in Billings, Montana
• Interstate 25 in Buffalo, Wyoming
• Interstate 29 in Sioux Falls, South Dakota
• Interstate 35 in Albert Lea, Minnesota
• Interstate 94 in Tomah, Wisconsin; joined for 91.76 miles (147.67 km) until Madison, Wisconsin.
• Interstate 39 in Portage, Wisconsin; joined for about 95 miles (152 km) until Rockford, Illinois.
• Interstate 43 in Beloit, Wisconsin
• Interstate 94 in Chicago, Illinois; joined for 16.71 miles (26.89 km)
• Interstate 55 in Chicago, Illinois
• Interstate 65 in Gary, Indiana
• Interstate 94 in Lake Station, Indiana
• Interstate 80 in Lake Station, Indiana; joined for 278.40 miles (448.04 km) until Lorain, Ohio.
• Interstate 69 in Fremont, Indiana
• Interstate 75 in Toledo, Ohio
• Interstate 71 in Cleveland, Ohio
• Interstate 77 in Cleveland, Ohio
• Interstate 271 in Willoughby, Ohio
• Interstate 79 in Erie, Pennsylvania
• Interstate 86 in Erie, Pennsylvania
• Interstate 81 in Syracuse, New York
• Interstate 88 in Rotterdam, New York
• Interstate 87 in Albany, New York
• Interstate 91 in West Springfield, Massachusetts
• Interstate 291 in Springfield, Massachusetts
• Interstate 84 in Sturbridge, Massachusetts
• Interstate 395 in Auburn, Massachusetts
• Interstate 495 in Westborough, Massachusetts
• Interstate 95 in Weston, Massachusetts (Map)
• Interstate 93 in Boston, Massachusetts (Map)

[edit] Spur routes

• Rapid City, South Dakota - I-190
• Chicago, Illinois - I-190 (provides a direct route to O'Hare International Airport), I-290
• Cleveland, Ohio - I-490
• Buffalo, New York - I-190, I-290, I-990
• Rochester, New York - I-390, I-490, I-590 (not directly connected)
• Syracuse, New York - I-690
• Utica, New York - I-790
• Schenectady, New York - I-890
• Spur to I-495 in Marlborough, Massachusetts - I-290
• Spur to Leominster, Massachusetts - I-190

It is arguable that Interstate 280 (Ohio) is as much a spur of Interstate 90 as it is of Interstate 80 because Interstate 80 and 90 designate the same highway (the Ohio Turnpike) in northwestern Ohio. It links to Toledo, Ohio and, with Interstate 75 to Detroit, Michigan.

Interstate 115 in Butte, Montana could make the same claim as well. In fact, the spur is cosigned with Interstate 15 Business and Interstate 90 Business for its entire length. (The two Business Loops continue eastbound through the city.)

	edit Auxiliary routes of Interstate 90
	Current and Future (F)	Former
	Illinois - Massachusetts - New York - South Dakota
	Illinois - Massachusetts - New York	Ohio
	New York
	New York - Ohio
	New York
	New York
	New York
	New York
	New York

[edit] References

[edit] External links

• Interstate lengths from the United States Department of Transportation
• Illinois Highway Ends: I-90
• Indiana Highway Ends: I-90
• Interstate 90 Exit Listing (New York)

edit Main Interstate Highways (multiples of 5 in pink)
4	5	8	10	12	15	16	17	19	20	22	24	25	26	27	29	30
35	37	39	40	43	44	45	49	55	57	59	64	65	66	66 (W)		68
69	70	71	72	73	74	75	76 (W)		76 (E)		77	78	79	80	81	82
83	84 (W)		84 (E)		85	86 (W)		86 (E)		87	88 (W)		88 (E)		89	90
91	93	94	95	96	97	99	(238)		H-1		H-2		H-3
Unsigned			A-1		A-2		A-3		A-4		PRI-1		PRI-2		PRI-3
Lists		Main - Auxiliary - Suffixed - Business - Proposed - Unsigned Gaps - Intrastate - Interstate standards - Replaced

Browse numbered routes
< I-82	WA		US 97 >
< US 89	ID		US 91 >
< MT 89	MT		US 91 >
< US 89	WY		WYO 90 >
< SD 89	SD		SD 101 >
< MN 89	MN		MN 91 >
< WIS 89	WI		WIS 90 >
< ILL 89	IL		ILL 90 >
< I-80	IN		I-94 >
< SR 89	OH		SR 91 >
< PA 89	PA		PA 90 >
< NY 89	NY		NY 90 >
< Route 88	MA		I-91 >

	edit State routes in Washington related to I-90
SR 900 - SR 902 - SR 903 (Spur) - SR 904 - SR 906 (Spur) - SR 908
Former or proposed state routes: SR 901 - SR 920