Interstate 585 is a short spur overlapping with U.S. 176 (N Pine Street) southeast from I-85 into Spartanburg. A diamond interchange joins the north end of I-585 with I-85/U.S. 176 at signalized intersections near Lone Oak. U.S. 176 was upgraded to Interstate standards southeast from the adjacent intersection with Upper Valley Falls Road / Fairforest Road to the University of South Carolina Upstate (USCS) campus by 2006. The original freeway for I-585 stretches 2.25 miles southeast from Business Loop I-85 into the city of Spartanburg by Pinewood Shopping Center.
Despite I-585 shields posted along U.S. 176 north to I-85, South Carolina Department of Transportation (GIS) data inventories only the section of U.S. 176 (N Pine Street) south from Business Loop I-85 as part of Interstate 585. Exit numbers for Interstate 585 utilize the mileposts of U.S. 176 starting from the North Carolina state line.
U.S. 176/S.C. 9 extend southeast along N Pine Street 0.57 miles to Garner Road. This section of arterial was formerly a part of Business Spur I-585. The last shield for the spur was removed after 2004, though a reassurance marker for I-585 north remains posted as of 2021.
Jim D’Amato, senior transportation planner with Spartanburg County, indicated that transportation planners were working on ramp upgrades and improvements to bring U.S. 176 to Interstate standards in order to tie into Interstate 85. He indicated that “Interstates have to link” in an article published by the Herald-Journal on February 2, 2005.4 Completed in 2006, work however left three at-grade intersections, including two at the diamond interchange with I-85.
There remain no plans to upgrade the exchange between I-85 and U.S. 176 to a freeway to freeway interchange. The US 176 Corridor Improvements underway between Winter 2017 and Winter 2018 instead made center median improvements and coordinated traffic signals from Springfield Road east to Fairforest Road. The $1.7 million project was approved on December 3, 2009.8