| State: | SD |
| Type: | I |
| Route: | 190 |
| Section: | 203 |
| Map Custom: | yes |
| Map Notes: | I-190 highlighted in red |
| Length Mi: | 1.72 |
| Length Ref: | [1] |
| Established: | 1958 |
| History: | Completed in 1962 |
| Spur Type: | I |
| Spur Of: | 90 |
| Direction A: | South |
| Terminus A: | in Rapid City |
| Direction B: | North |
| Terminus B: | in Rapid City |
| Counties: | Pennington |
| Previous Type: | SD |
| Previous Route: | 168 |
| Next Type: | SD |
| Next Route: | 203 |
Interstate 190 (I-190) is an auxiliary Interstate Highway in the US state of South Dakota. The route runs for about 2miles connecting I-90 to downtown Rapid City. The entire route is concurrent with US Highway 16 (US 16). It is the westernmost auxiliary route of I-90 (approximately 1190miles east of the highway's western terminus in Seattle, Washington) and its only auxiliary route west of the Mississippi River.
I-190 begins as West Boulevard and has an intersection with Omaha Street, which is signed as US 16/South Dakota Highway 44 (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 onramp 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.
Legally, the route of I-190 is defined at South Dakota Codified Laws § 31-4-203.[2]
A freeway replacing West Bypass to connect downtown Rapid City to I-90 was proposed by the city government.[3] The designation of I-190 for this connector was approved by the American Association of State Highway Officials in November 1958.[4]
I-190 was opened in 1962 to connect Rapid City to the recently completed I-90 bypass, which was built outside of Rapid City's northern boundaries.[5]
The interchange with I-90 was rebuilt from 2000 to 2001, changing from a directional T interchange with a left exit to a trumpet interchange.[6] [7] [8] The Omaha Street intersection was rebuilt in 2004,[9] while the North Street interchange was converted to a single-point urban interchange in 2017.[10]