 Interstate 90 | ||||
|---|---|---|---|---|
| Purple Heart Memorial Highway | ||||
 I-90 highlighted in red | ||||
| Route information | ||||
| Maintained by SDDOT | ||||
| Length | 412.76 mi[1] (664.27 km) | |||
| NHS | Entire route | |||
| Major junctions | ||||
| West end |   I-90 / US 14 at Wyoming state line | |||
  US 85 / I-90 BL in Spearfish  I-190 / US 16 in Rapid City US 14 near Wall US 83 / I-90 BL in Murdo US 83 / SD 53 in Vivian US 183 / I-90 BL in Presho US 281 in Plankinton US 81 near Salem I-29 in Sioux Falls I-229 in Sioux Falls | ||||
| East end | I-90 at Minnesota state line | |||
| Location | ||||
| Country | United States | |||
| State | South Dakota | |||
| Counties | Lawrence, Meade, Pennington, Jackson, Jones, Lyman, Brule, Aurora, Davison, Hanson, McCook, Minnehaha | |||
| Highway system | ||||
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Interstate 90 (I-90) in the US state of South Dakota traverses east–west through the southern half of the state.
- ^ Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved September 17, 2022.