Interstate 190 (South Dakota)

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Interstate 190 marker

Interstate 190
Route information
Defined by SDCL §31-4-203
Maintained by SDDOT
Length: 1.72 mi[1] (2.77 km)
Existed: 1962 – present
Major junctions
South end: I-90 Bus. / US 16 / SD 44 / SD 79 in Rapid City
North end: I-90 / US 14 / US 16 in Rapid City
Highway system
  • South Dakota Highways
SD 168 SD 203

Interstate 190 (I-190) is an auxiliary Interstate Highway in the U.S. state of South Dakota. The route runs for about 2 miles (3.2 km) connecting I-90 to downtown Rapid City. Its length from I-90 to Omaha Street runs concurrent with US 16. It is the westernmost auxiliary route of I-90 (approximately 1,190 miles (1,920 km) east of the highway's western terminus in Seattle, Washington) and its only auxiliary route west of the Mississippi River.

Route description[edit]

I-190 begins as West Boulevard and has an intersection with Omaha Street, which is signed as US 16/SD 44. US 16 westbound goes east on Omaha Street and eastbound runs north concurrently with I-190. I-190 then becomes a freeway, with an exit to North Street. I-190 then passes under Anamosa Street before an on-ramp from the northbound lanes of West Boulevard. Both US 16 and I-190 then terminate at a trumpet interchange with I-90/US 14/SD 79.[2]

State law[edit]

Legally, the route of I-190 is defined at South Dakota Codified Laws § 31-4-203.[3]


Interstate 190 is a spur route on the Interstate Highway System connecting Interstate 90 with Omaha Street (SD Highway 44) in the central business district of Rapid City, SD. Interstate 190 is an auxiliary Interstate Highway that runs 1.72 miles from I-90 Exit 57 southward into downtown Rapid City. It also carries the designation U.S. Highway 16 and was opened in 1962. It was constructed to fulfill part of the Interstate’s original mission of connecting major cities. At the time that the route for Interstate 90 was being selected, Rapid City did not extend as far north as it currently does. Consequently, the I-190 link was built to provide the desired Interstate link between Rapid City and the rest of the Interstate system. Rapid City has now grown to encompass roughly six miles of Interstate 90 and is served by six I-90 interchanges.

Exit list[edit]

All exit numbers start with 1. The entire route is in Rapid City, Pennington County.

mi[4] km Exit Destinations Notes
0.00 0.00 To I-90 Bus. / West Boulevard Southern terminus
0.43 0.69 US 16 west / SD 44 / Omaha Street – Mount Rushmore Southern end of US 16 concurrency
0.87 1.40 C North Street – Rushmore Plaza Civic Center
1.46 2.35 A–B I-90 / US 14 / SD 79 – Gillette, Sioux Falls Exit 57 (I-90); northbound exit and southbound entrance; eastern terminus of US 16, northern terminus; trumpet interchange.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Google

KML is from Wikidata