List of Interstate Highways in South Dakota

The Interstate Highways in South Dakota are the segments of the Dwight D. Eisenhower National System of Interstate and Defense Highways owned and maintained by the South Dakota Department of Transportation in the US state of South Dakota.

Standard South Dakota highway shields
System information
NotesSouth Dakota highways are generally state-maintained.
Highway names
InterstatesInterstate X (I-X)
US HighwaysU.S. Highway X (US X)
State(State) Highway X (SD X)
System links
  • South Dakota Highways

Mainline highways
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-29 252.50406.36 I-29 at the Iowa state line at Dakota DunesI-29 / US 81 at the North Dakota state line north-northwest of Victor 01958-01-011958current  
I-90 412.76664.27 I-90 at the Wyoming state line west-northwest of North SpearfishI-90 at the Minnesota state line north-northeast of Valley Springs ——  
I-190 1.722.77 US 16 / SD 44 / West Boulevard in Rapid CityI-90 / US 14 / US 16 / SD 79 in Rapid City 01962-01-011962current  
I-229 11.3318.23 I-29 in Sioux FallsI-90 / CR 125 north of Sioux Falls 01966-01-011966current  

Business routes
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-29 Bus. —— —— —— Serves Elk Point
I-29 Bus. —— —— —— Serves Sioux Falls
I-29 Bus. —— —— —— Serves Brookings
I-90 Bus. —— —— —— Serves Spearfish
I-90 Bus. —— —— —— Serves Sturgis
I-90 Bus. —— —— —— Serves Rapid City
I-90 Bus. —— —— —— Serves Wall
I-90 Bus. —— —— —— Serves Kadoka
I-90 Bus. —— —— —— Serves Murdo
I-90 Bus. —— —— —— Serves Presho
I-90 Bus. —— —— —— Serves Chamberlain
I-90 Bus. —— —— —— Serves Mitchell
I-90 Bus. —— —— —— Serves Sioux Falls
I-229 Bus. —— —— —— Serves Sioux Falls

See also
  • U.S. Roads portal

References
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