Interstate 90 in South Dakota

Interstate 90 (I-90) in the US state of South Dakota traverses east–west through the southern half of the state.

This article is about the section of Interstate 90 in South Dakota. For the entire route, see Interstate 90.

Interstate 90

Purple Heart Memorial Highway
I-90 highlighted in red
Route information
Maintained by SDDOT
Length412.76 mi (664.27 km)
NHSEntire route
Major junctions
West end I-90 / US 14 at Wyoming state line
Major intersections 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
CountryUnited States
StateSouth Dakota
CountiesLawrence, Meade, Pennington, Jackson, Jones, Lyman, Brule, Aurora, Davison, Hanson, McCook, Minnehaha
Highway system
  • Main
  • Auxiliary
  • Suffixed
  • Business
  • Future
  • South Dakota State Trunk Highway System
  • Interstate
  • US
  • State
← SD 89→ SD 100
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