Interstate 190 (South Dakota)

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Interstate 190

Route information
Auxiliary route of I-90
Defined by SDCL §31-4-203
Maintained by SDDOT
Length1.72 mi[1] (2.77 km)
HistoryCompleted in 1962
NHSEntire route
Major junctions
South end I-90 BL / US 16 / SD 44 / SD 79 in Rapid City
North end I-90 / US 14 / US 16 / SD 79 in Rapid City
CountryUnited States
StateSouth Dakota
Highway system
  • South Dakota State Trunk Highway System
SD 168 SD 203

Interstate 190 (I-190) is an auxiliary Interstate Highway in the US state of South Dakota. The route runs for about two miles (3.2 km) connecting I-90 to downtown Rapid City. Its length from I-90 to Omaha Street runs concurrent with US Highway 16 (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

Northern terminus at I-190

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.[3]

State law

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


A freeway replacing West Bypass to connect downtown Rapid City to I-90 was proposed by the city government.[5] The designation of I-190 for this connector was approved by the American Association of State Highway Officials in November 1958.[2]

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.[6]

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.[7][8][9] The Omaha Street intersection was rebuilt in 2004,[10] while the North Street interchange was converted to a single-point urban interchange in 2017.[11]

Exit list

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

To I-90 BL / West Boulevard south
Southern terminus of I-190; roadway continues as West Boulevard; stoplight intersection
US 16 west / SD 44 (Omaha Street) – Mount Rushmore
Southern end of US 16 concurrency
0.871.40CNorth Street – Civic Center
1.462.35A–B I-90 (US 14 / SD 79) – Gillette, Sioux FallsNorthern terminus of I-190; eastern terminus of US 16; northern end of US 16 concurrency; northbound exit and southbound entrance; left exit A to 90 westbound; trumpet interchange; I-90 exit 57
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved November 30, 2022.
  2. ^ a b Johnson, A. E. (November 10, 1958). "Correspondence with H. C. Kempfer". American Association of State Highway Officials. p. 1. Retrieved December 4, 2021 – via AASHTO Route Numbering Archive.
  3. ^ Google (2011-09-07). "I-190" (Map). Google Maps. Google. Retrieved 2011-09-07.
  4. ^ "South Dakota Codified Laws - § 31-4-203". South Dakota Legislature. Retrieved 2008-06-25.
  5. ^ Niciejewski, Ed (March 11, 1958). "Rapid City Important Point On Interstate; City Plans Connecting Links For Interstate". Rapid City Journal. p. 19. Retrieved December 9, 2021 – via
  6. ^ "I-190/Silver Street Study: Interchange Modification Justification Report" (PDF). South Dakota Department of Transportation. December 2011. p. 8. Retrieved January 19, 2018.
  7. ^ Ross, Denise (March 1, 1998). "I-90 projects ready to go". Rapid City Journal. p. 31. Retrieved September 9, 2021 – via
  8. ^ Daly, Dan (July 16, 2000). "Detourism; Businesses cope with construction". Rapid City Journal. p. F1. Retrieved September 9, 2021 – via
  9. ^ Miller, Steve (July 27, 2001). "I-90 project nears end; lanes open". Rapid City Journal. p. B1. Retrieved September 9, 2021 – via
  10. ^ "Omaha Street, Rapid City: What is Being Built". South Dakota Department of Transportation. 2004. Archived from the original on August 15, 2004. Retrieved January 19, 2018.
  11. ^ Holland, Jim (October 2, 2017). "Good news, Rapid City drivers: The I-190 project is nearly done". Rapid City Journal. Retrieved January 19, 2018.
  12. ^ "Transportation Inventory Management". South Dakota Department of Transportation. Retrieved 2008-06-25.