Interstate 585 South Carolina
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
North End – Lone Oak, SC
South End – Spartanburg, SC
Mileage – 2.25
Cities – Spartanburg
- Junctions –
Source: December 31, 2018 Interstate Route Log and Finders List
Portions of the original alignment of Interstate 85 through Upstate South Carolina were constructed in the 1940s as a bypass for U.S. 29. The substandard and narrow design through Spartanburg led to the relocated I-85, which was built between 1988 and 1995.
Interstate 585 opened as a freeway for U.S. 176 in 1957.1,5 It was built in conjunction with projects to upgrade the U.S. 29 bypass of Spartanburg to Interstate 85.
Movement to relocate Interstate 85 away from Spartanburg onto a new alignment in 1983 led to a Spartanburg Area Transportation Study (SPATS) committee vote in 1984 pertaining to area highways. The SPATS recommendation to the South Carolina Highway Department included an access improvement plan for both Interstate 585 and Asheville Highway (S.C. 56). A study presented to Spartanburg City Council in May 1984 recommended designating both I-585 and S.C. 56 as primary routes to and from the Spartanburg central business district while renumbering the old I-85 as Interstate 285 once the new alignment for I-85 opened to the north. Improvements proposed for I-585 and S.C. 56 included new way finding signs for Uptown Spartanburg, extending street lighting, replacing the Hearon Circle with a diamond interchange and building a half cloverleaf interchange between Pine Street (Business Spur I-585 / U.S. 176) and McCravy Drive. The SPATS committee however differed on city council study, suggesting the highway department consider an alternative to the McCravy Drive interchange.10 Upgrades at Hearon Circle or for Pine Street at McCravy Drive were never implemented.
Prior to 1995, Interstates 85 and 585 met directly at the cloverleaf interchange by the Milliken Arboretum. Opening during August of that year was the new alignment for I-85 taking the route further north from Spartanburg. This left the old alignment as Business Loop I-85 due to its substandard design.
U.S. 176 was upgraded to Interstate standards from Business Loop I-85 northwest to Interstate 85 as part of a two-phase project starting in 2003. The first phase involved interchange construction at both Campus Boulevard to USCS and Valley Falls Road. Phase two focused on upgrading the remainder of U.S. 176 to Interstate 85.2 Costing $62 million, road work was formally completed following a ribbon cutting ceremony held on October 25, 2006.3
Further south in Spartanburg, a $3.5-million project added a new off-ramp from Interstate 585 east to South Carolina 9 (Church Street) to replace an adjacent ramp to U.S. 221 (Whitney Road). The work modified the S.C. 9 on-ramp to I-585 into a distributor roadway connecting the new S.C. 9 exit with U.S. 221. This replaced a weaving traffic pattern on the I-585 mainline leftover from the 1950s design of the freeway. Construction on the ten-month project started in May 2005.4
The California Avenue overpass at Exit 24 was damaged by a tractor trailer hauling machinery in January 2014. The incident dislocated the span by nearly five feet, leading to its closure and demolition.5 A $12-million project followed to replace both the damaged span and to raise the height on the nearby bridge carrying S.C. 9 over I-585 by two feet.6 The California Avenue bridge reopened in March 2015, followed by the completion of associated I-585 repaving and the S.C. 9 overpass work in mid-June 2015.7
North End – near Lone Oak, South Carolina
Former Northern Terminus – Spartanburg, South Carolina
South End – Spartanburg, South Carolina
- Interstate 585 (Kurumi).
- "Agency mapping new route to USCS." Herald-Journal (Spartanburg, SC), February 12, 2001.
- "Millions aid Spartanburg traffic flow." Herald-Journal (Spartanburg, SC), December 6, 2007.
- "Highway project near USC Upstate open to drivers." Herald-Journal (Spartanburg, SC), October 14, 2006.
- "Project will smooth rough intersection." Herald-Journal (Spartanburg, SC), February 2, 2005.
- "Pine Street lane closures announced to demolish California Avenue Bridge." Herald-Journal (Spartanburg, SC), June 26, 2014.
- "Work continues on Interstate 585 bridge." Herald-Journal (Spartanburg, SC), February 2, 2015.
- "Highway 9 bridge reopens to traffic after being closed for repairs." Herald-Journal (Spartanburg, SC), June 19, 2015.
- Project Information – US 176 Corridor Improvements, Project Identification Number: 0039714RD01. SCDOT web site.
- "Asheville Highway, I-585 Access Improvements Recommended." Herald-Journal (Spartanburg, SC), June 16, 1984.
Page updated January 30, 2019.