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. The entire route is 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.

Quick Facts Route information, Length ...

Interstate 190
I-190 highlighted in red
Route information
Auxiliary route of I-90
Maintained by SDDOT
Length	1.72 mi[1] (2.77 km)
Existed	1958[2]–present
History	Completed in 1962[citation needed]
NHS	Entire 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
Location
Country	United States
State	South Dakota
Counties	Pennington
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future South Dakota State Trunk Highway System Interstate US State
← SD 168 → SD 203

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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]

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]

The entire route is in Rapid City, Pennington County.

More information mi, km ...

mi[12]	km	Exit	Destinations	Notes
0.00	0.00		To I-90 BL / West Boulevard south	Southern terminus of I-190; roadway continues as West Boulevard; stoplight intersection
0.43	0.69		US 16 west / SD 44 (Omaha Street) – Mount Rushmore	Southern end of US 16 concurrency
0.87	1.40	1C	North Street – Civic Center
1.46	2.35	1A–1B	I-90 (US 14 / SD 79) – Gillette, Sioux Falls	Northern 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       Concurrency terminus

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