Interstate 190 (South Dakota)

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.

Interstate 190
I-190 highlighted in red
Route information
Auxiliary route of I-90
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 / SD 79 in Rapid City
Location
Counties	Pennington
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future South Dakota Highways Interstate U.S. State ← SD 168 SD 203 →

Route description

Northern terminus at Interstate 90.

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

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

History

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.[4]

The interchange with I-90 was rebuilt in the late 1990s, changing from a directional-T interchange with a left exit to a trumpet interchange. The Omaha Street intersection was rebuilt in 2004,[5] while the Silver Street interchange was converted to a single-point urban interchange in 2017.[6]

Exit list

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

mi[7]	km	Exit	Destinations	Notes
0.00	0.00		To I-90 Bus. / West Boulevard south	Southern terminus of I-190; roadway continues as West Boulevard.
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 – Civic Center
1.46	2.35	A–B	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

References

1. "Route Log and Finder List - Interstate System: Table 2". FHWA. Retrieved 2007-10-03.
2. Google (2011-09-07). "I-190" (Map). Google Maps. Google. Retrieved 2011-09-07.
3. "South Dakota Codified Laws - § 31-4-203". South Dakota Legislature. Retrieved 2008-06-25.
4. "I-190/Silver Street Study: Interchange Modification Justification Report" (PDF). South Dakota Department of Transportation. December 2011. p. 8. Retrieved January 19, 2018.
5. "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.
6. Holland, Jim (October 2, 2017). "Good news, Rapid City drivers: The I-190 project is nearly done". Rapid City Journal. Retrieved January 19, 2018.
7. "Transportation Inventory Management". South Dakota Department of Transportation. Retrieved 2008-06-25.

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