Interstate 90 in South Dakota

Interstate 90 marker
Interstate 90
Purple Heart Memorial Highway
Map
I-90 highlighted in red
Route information
Maintained by SDDOT
Length412.76 mi[1] (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
  • 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.

  1. ^ 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.