Interstate 190 (South Dakota)
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| Route information | |
| Defined by SDCL §31-4-203 | |
| Maintained by SDDOT | |
| Length: | 1.72 mi (2.77 km) |
| Existed: | 1962 – present |
| Major junctions | |
| South end: |
    I-90 Bus. / US 16 / SD 44 / SD 79 in Rapid City
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| North end: |
  I-90 / US 14 / US 16 in Rapid City
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| Highway system | |
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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) south, 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.
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.
Legally, the route of I-190 is defined at South Dakota Codified Laws § 31-4-203.
All exit numbers begin with 1. Only lettered exits are given. The entire route is in Rapid City, Pennington County.
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