Interstate 90 in South Dakota

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 the Wyoming state line near Beulah, WY
Major intersections
East end I-90 at the Minnesota state line near Valley Springs
Location
CountryUnited States
StateSouth Dakota
CountiesLawrence, Meade, Pennington, Jackson, Jones, Lyman, Brule, Aurora, Davison, Hanson, McCook, Minnehaha
Highway system
  • South Dakota State Trunk Highway System
← SD 89→ SD 100

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

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