Interstate 585

I-585 is co-signed the entire length with U.S. Route 176 (US 176) and it uses US 176's exit number system instead of its own. Between exits 23 (I-85 Business) and 25B (US 221) the road is a freeway but has substandard or no shoulders. To the south of exit 25B, US 176 becomes boulevard grade, where I-585 ends.[3]

The location of I-585 was planned as I-26 in this 1955 map. The connection along US 221 was never built.

This highway was once connected to I-85 from opening until 1995; that year, I-85 was moved north to bypass Spartanburg, leaving I-585 as an orphan, segregated from the rest of the Interstate Highway system. There is a project underway to extend I-585 along US 176 to I-85's new location.[4] The ramps from I-585 southbound to I-85 Bus. north and south opened on October 9, 2006; subsequent ramps between the two roads have since been reopened including a large fly-over ramp that overpasses the East Campus Boulevard exit.

Currently, US 176 remains a freeway north of the I-85 Bus. interchange until a traffic signal with Upper Valley Falls Road, prior the interchange with I-85. Some vehicles on US 176 must cross oncoming traffic in order to access a some directions of I-85 as it is a typical diamond interchange.

Exit numbers are based on US 176 mileage. The entire route is in Spartanburg County.

Location	mi[2][3]	km	Exit	Destinations	Notes
Spartanburg	2.25	3.62	—	US 176 east / SC 9 south (Pine Street)	Continuation as US 176/SC 9
​	2.21	3.56	25	US 221 (Boiling Springs Road) / SC 9 north (Church Street / Whitney Road) – Chesnee, Roebuck, Boiling Springs	Signed exit 25B (US 221) and 25A (SC 9 northbound) for I-585 northbound; no northbound entrance from exit 25A; northern end of SC 9 concurrency
​			24	California Avenue
Southern Shops–Valley Falls line	0.00	0.00	23	I-85 Bus. – Charlotte, Greenville	Current northern terminus; signed as exits 23A (south) and 23B (north)
	1.30	2.09	–	East Campus Boulevard – USC Upstate	Exit open, but not formally part of I-585
	0.80	1.29	–	Valley Falls Road	Exit open, but not formally part of I-585
	0.00	0.00	–	I-85 / US 176 west – Charlotte, Greenville, Inman	Future northern terminus; future western end of US 176 concurrency, diamond interchange
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access       Unopened

Interstate 585 Business (I-585 Bus) was a boulevard-grade business spur of I-585 along Pine Street, between Whitney Road (US 221) and St. John Street (US 29). It ran concurrently with US 176 and SC 9. Sometime between 2000 and 2012, the route was removed, with no current state or federal maps listing it, nor any physical signage.

• United States portal
• U.S. Roads portal

• Media related to Interstate 585 at Wikimedia Commons
• Mapmikey's South Carolina Highways Page: I-385
• I-585 at SouthEastRoads.com
• I-585 at Interstate-Guide.com
• Interstate 585 (3 Digit Interstates)