List of Interstate Highways in South Dakota

Interstate Highways in South Dakota
Interstate Highways in South Dakota
	Standard South Dakota highway shields
	Interstate Highways highlighted in red
System information
Notes	South Dakota highways are generally state-maintained.
Highway names
Interstates	Interstate X (I-X)
US Highways	U.S. Highway X (US X)
State	(State) Highway X (SD X)
System links
	South Dakota State Trunk Highway System; Interstate; US; State;

Mainline highways


Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed
I-29	252.50	406.36	I-29 at the Iowa state line at Dakota Dunes	I-29 / US 81 at the North Dakota state line north-northwest of Victor	01958-01-011958	current
I-90	412.76	664.27	I-90 at the Wyoming state line west-northwest of North Spearfish	I-90 at the Minnesota state line north-northeast of Valley Springs	—	—
I-190	1.72	2.77	US 16 / SD 44 / West Boulevard in Rapid City	I-90 / US 14 / US 16 / SD 79 in Rapid City	01962-01-011962	current
I-229	11.33	18.23	I-29 in Sioux Falls	I-90 / CR 125 north of Sioux Falls	01966-01-011966	current


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