Interstate 585 is a short spur from Interstate 85 east into Spartanburg via U.S. 176 (Pine Street). The route connects to its parent via and at-grade connection with U.S. 176 near Lone Oak. The freeway portion stretches southeast from Fairforest Road to the University of South Carolina Upstate (USCS) campus and into Spartanburg by Pinewood Shopping Center.
Until 2006, Interstate 585 ended at Business Loop I-85, resulting in a unique situation where the Interstate was disconnected from the rest of the system. While upgrades extended the Interstate standard portion of U.S. 176 northward, the junction with I-85 is not a high speed connection.
Exit numbers posted along Interstate 585 utilize the mileposts of U.S. 176 starting from the North Carolina state line. The two routes overlap for the entirety of the freeway, with Pine Street extending south from the freeway end dually as both U.S. 176 and South Carolina 9.
A 0.3-mile segment of Pine Street south to Garner Road doubles as Business Spur I-585. An unsigned route since 2004, shields for the designation were posted previously along U.S. 176, including an erroneous I-585 reassurance marker appearing near McCravy Drive.
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 The 2006 completed 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 cordinated traffic signals from Springfield Road east to Fairforest Road. The $1.7-million project was approved on December 3, 2009.8