East 
South
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The rest areas along I-90/U.S. 14-SD 79 east of Bald Mountain were converted to parking areas in 2018.
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The eastbound roadway for Interstate 90 was rebuilt so that it no longer ran adjacent to Sturgis Road. The westbound roadway was relocated to accommodate a wider freeway median.
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Bethlehem Road is the first of two exits from Interstate 90 for the city of Piedmont.
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Elk Creek Road stems east from adjacent Sturgis Road (old U.S. 14) in Piedmont to the diamond interchange at Exit 46.
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Stage Stop Road meets I-90/U.S. 14-SD 79 at a diamond interchange (Exit 48) within the city of Summerset.
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Exit 52 at Black Hawk is the first of seven interchanges serving the city of Rapid City from Interstate 90.
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Business Loop I-90 to Rapid City commences south from the diamond interchange (Exit 52) with Peaceful Pines Road.
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The former alignment of Interstate 90 made an S-curve across the adjacent CP Rail Systems line to a half diamond interchange with the west end of Business Loop I-90.
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Grading remains visible from the former exchange and alignment of Interstate 90. Construction realigning I-90 at Blackhawk was completed in 2009.
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Business Loop I-90 overtakes Sturgis Road (old U.S. 14) just west of Exit 52 as part of an 11.3 mile long course across Rapid City.
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I-90/U.S. 14-SD 79 continue southeast into Pennington County between Black Hawk and Boxelder Creek.
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Mount Rushmore National Memorial is located southwest of Rapid City along U.S. 16A and SD 244, 25 miles via I-190/U.S. 16 or 27 miles via the bypass along U.S. 16 Truck.
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The speed limit reduces to 65 miles per hour as Interstate 90 heads south into Rapid City.
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Deadwood Avenue is SD 445 south from the diamond interchange at Exit 55 to SD 231 (Omaha Street) in Rapid City.
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Interstate 190 spurs 1.82 miles south from Exit 57 to SD 44 (Omaha Street) just outside Downtown Rapid City.
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U.S. 16 combines with I-190 south to Omaha Street and Mount Rushmore Road through Downtown Rapid City.
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Interstate 190 south and U.S. 16 west travel south from a trumpet interchange (Exit 57) with I-90/U.S. 14-SD 79. U.S. 16 runs 69.20 miles from I-190 to Hill City, Custer and Wyoming east of Newcastle.
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East 
West South
A SPUI (Exit 58) joins Interstate 90 with Haines Avenue to the immediate east of I-190/U.S. 16.
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Construction on the I-90 (Exit 59) LaCrosse Street Diverging Diamond Interchange (DDI) project got underway in February 2021. Work converting the previous diamond interchange wraps up in June 2023.1
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U.S. 16 Truck accompanies Interstate 90 east from the end of U.S. 16 at I-190, 4.1 miles to Exit 61 / Elk Vale Road.
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Auxiliary lanes were added along Interstate 90 between I-190 and LaCrosse Street by November 2021 as part of the I-90 (Exit 59) LaCrosse Street Diverging Diamond Interchange (DDI) project.
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Business Loop I-90 returns to I-90 from Rapid City at the forthcoming SPUI (Exit 60) with E North Street.
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U.S. 16 Truck west and SD 79 south part ways with I-90/U.S. 14 east at the SPUI (Exit 61) with Elk Vale Road.
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U.S. 16 Truck circumvents Rapid City southwest 9.02 miles to U.S. 16 (Mt. Rushmore Road). SD 79 heads 47.7 miles south from the bypass to Hermosa and U.S. 18 at Maverick Junction.
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East
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Sources:
- I-90 (Exit 59) LaCrosse Street Diverging Diamond Interchange (DDI) project March 2021 Newsletter. https://i90lacrosseddi.com/documents/2021_Feb-March 20LaCrosse Newletter.pdf
Photo Credits:
08/12/16 by AARoads
Connect with:
Interstate 190
Business Loop I-90 - Rapid City
U.S. 16
Page Updated 02-22-2023.