Interstate 90

**Interstate 90 (I-90)** is a transcontinental freeway, and the longest Interstate Highway in the United States at 3,020.54 miles. Its western terminus is in Seattle, at State Route 519 near Safeco Field and CenturyLink Field, and its eastern terminus is in Boston, at Route 1A near Logan International Airport. The western portion of I-90 crosses the Continental Divide over Homestake Pass just east of Butte, Montana, connecting major cities such as Spokane, Washington, Billings, Montana, Sioux Falls, South Dakota, and Madison, Wisconsin. East of the Mississippi River, much of I-90 is a toll road, while west of the Mississippi, much of I-90 is a toll-free express route, meaning that speed limits range from 65 MPH to 80 MPH, with exceptions in major urban areas and very mountainous areas.

## Route description

Interstate 90 starts at Massachusetts Route 1A in Boston, near Logan International Airport. It almost immediately passes under Boston Harbor and the Fort Point Channel of Boston Harbor, via the Ted Williams Tunnel and the Fort Point Channel Tunnel. These two tunnels mark the beginning of the Massachusetts Turnpike, which is a toll road stretching 138 miles across the state between the Fort Point Channel Tunnel and West Stockbridge, Massachusetts.

West of Massachusetts, I-90 enters New York State, and remains tolled as the New York State Thruway. The West Stockbridge Toll Plaza closes the Massachusetts Turnpike toll system, and there is a brief stretch of about 3 miles of toll-free roadway between the West Stockbridge Toll Plaza and the Canaan Toll Plaza, which opens the New York State Thruway toll system. The Canaan Toll Plaza is located on the Berkshire Parkway, which is a spur of the New York State Thruway not technically signed as I-90, but often referred to as such. After interchanging with the Taconic State Parkway, the Berkshire Parkway splits to the west, while the New York Thruway turns towards the northwest and towards downtown Albany. The Berkshire Parkway crosses the Hudson River via the Castleton-on-Hudson Bridge, and rejoins I-90 at the Circle Stack Interchange in downtown Albany. The New York State Thruway proper through Albany crosses the Hudson River via the Patroon Island Bridge. West of Albany, the New York State Thruway extends to Buffalo, where it ends at the junction of the Niagara Thruway (I-190), near Kennington Regional Airport.

I-90 is toll free in Pennsylvania, and also spends the shortest amount of time in Pennsylvania than any other state. In Pennsylvania, I-90 is the main highway corridor through the city of Erie.

In Ohio, I-90 is toll free for the eastern 50 miles. In Cleveland, I-90 crosses the Cuyahoga River via the George V. Voinovich Memorial Bridge. Just west of Cleveland, I-90 interchanges with I-76, and I-80 merges in with I-90 as one concurrent highway. This highway is tolled as the Ohio Turnpike. I-90 and I-80 remains with I-90 as one highway across north central Ohio as well as northeastern Indiana.

Upon entering Indiana, the Ohio Turnpike becomes the Indiana Toll Road. After a brief 5 miles, the Indiana Toll Road interchanges with both I-69, which provides access to Detroit and points north, as well as Indianapolis and points south. The Indiana Toll Road ends in Gary, Indiana, and I-90 is toll free through the westernmost portions of the Hoosier State.

In Illinois, the highway becomes elevated through Chicago and is tolled as the Chicago Skyway. This elevated viaduct constists of a massive cantilevered truss bridge over the Calumet River, and also provides some of the best views of Lake Michigan and downtown Chicago that are available from an automobile. After passing through downtown Chicago, I-90 returns to grade level and is tolled as the Jane Addams Turnpike, also known as the Jane Addams Memorial Tollway. The western terminus of the Addams Tunrpike, located at the Wisconsin-Illinois state line border marks the end of the I-90 toll road system. West of the border, only one mainline toll plaza is present at the Dresbach Bridge over the Mississippi River, as well as another mainline toll plaza at the Lewis and Clark Memorial Bridge over the Missouri River. However, except for these bridge tolls, I-90 is toll free from Illinois to Washington State.

West of the Mississippi, I-90 travels through a large section of “The Middle of Nowhere” through Minnesota, South Dakota, and Wyoming. In northeastern Wyoming, I-90 passes through the town of Sheridan, before crossing into Montana and passing through the city of Billings. West of Billings, the highway passes through several different mountain passes, many of which offer spectacular views of the Rocky Mountains and the associated mountain ranges. Upon entering Washington State, I-90 crosses the Columbia River at one of its widest points via the Vantage Bridge, and then passes through the largest mountain pass along the route - Snoqualmie Pass. The highway then proceeds west for approximately an additional 30 miles, before crossing Lake Washington via the Homer M. Hadley Memorial Bridge and the Lacy V. Murrow Memorial Bridge. The highway ends about 2 miles after interchanging with Interstate 5. The spur route that makes up the end of the highway is located between two large sports stadiums in Seattle, Washington.

## I-90 Corridor Rivers

The following rivers are located within the Interstate 90 corridor. Note that many of them are not crossed by I-90 itself, but all of them are located within a general proximity to the route of I-90.

### Massachusetts

* Mystic River
* Chelsea River
* Chicopee River

### New York

* Hudson River
* Mohawk River
* Schoharie Creek
* Niagara River

### Ohio

* Ashtabula River
* Cuyahoga River
* Black River
* Sandusky Bay
* Maumee River

### Illinois

* Calumet River
* Chicago River

### Washington

* Columbia River
* Lake Washington

## I-90 Corridor Bridges

The following table lists all of the notable bridges along the I-90 Corridor, what state they are located in, what river they cross, and whether or not they are tolled. Note that just like with the list of rivers above, not all bridges will be on the actual I-90 highway itself.