page_title: Interstate 90
section_title: South Dakota
hierarchical_section_title: Interstate 90 / Route description / South Dakota
caption_attribution_description: English: The Missouri River as seen from a rest stop on Interstate 90 just south of Chamberlain, South Dakota, and east of the river.
context_page_description: Interstate 90 is an east–west 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 T-Mobile Park 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.
  Between Seattle and the Wisconsin-Illinois state line, I-90 is an Interstate without tolls. East of that border, much of I-90 follows several toll roads, many of which predate the Interstate Highway system. These include the Jane Addams Memorial Tollway, Chicago Skyway, Indiana Toll Road, Ohio Turnpike, New York State Thruway, and the Massachusetts Turnpike. The Interstate is not tolled through some segments in downtown Chicago; Greater Cleveland and the rest of Northeast Ohio; Erie and the rest of Northwestern Pennsylvania; and through brief sections near Buffalo and Albany.
context_section_description: Near Rapid City at the Wyoming border I-90 is a four-lane divided highway with a grass median. In the Sioux Falls area, I-90 intersects I-29 and continues east a short distance to Minnesota. I-90 is the longest east–west thoroughfare in South Dakota. This interstate goes through Mitchell, Sioux Falls, and Rapid City. It does not go through the state capital of Pierre.
  The South Dakota section of I-90 is defined at South Dakota Codified Laws § 31-4-184.
caption: The Missouri River viewed from a rest stop off I-90 just south of Chamberlain, South Dakota
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