Interstate 585

Interstate 585 (I-585) is a 2.25-mile-long (3.62 km) auxiliary Interstate Highway of I-85 in the US state of South Carolina. It is an orphan auxiliary route to I-85 since 1995 when the Interstate was relocated further north bypassing Spartanburg. In a concurrency with US Highway 176 (US 176) throughout, it spurs south from I-85 Business (I-85 Bus) for a couple of miles before entering Spartanburg.

Interstate 585
North Pine Street
I-585 highlighted in red
Route information
Auxiliary route of I-85
Maintained by SCDOT
Length	2.25 mi[1][2] (3.62 km)
Existed	1962[citation needed]–present
NHS	Entire route
Major junctions
South end	US 176 / US 221 / SC 9 in Spartanburg
North end	I-85 BL / US 176 near Spartanburg
Location
Country	United States
State	South Carolina
Counties	Spartanburg
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future South Carolina State Highway System Interstate US State Scenic
← SC 576 → US 601

Route description

I-585 is cosigned the entire length with US 176 and it uses US 176's exit number system instead of its own. The route is also signed as North Pine Street its entire length. The southern terminus begins at exit 25, where the road continues as US 176/South Carolina Highway 9 (SC 9). I-585 remains concurrent with US 176 starting at exit 25 as it heads northwest. It then comes across a partial interchange with California Avenue at exit 24. Before exit 23, there are two at-grade auxiliary lanes, one on each side which connects Milliken Road on the north side and Graham Road on the south side to the highway. At exit 23, the highway comes across I-85 Bus, forming a parclo interchange, ending just north of it. US 176 continues west to I-85.^[3]

History

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

From the highway's initial designation until 1995, I-85 followed what is now designated I-85 Bus. In that year, I-85 moved to the north, orphaning I-585 from a direct connection to its parent route, a situation that remained until upgrades to US 176 over the next decade provided a freeway connection between I-85 and I-85 Bus, except for a stoplight at Upper Valley Falls Rd/Fairforest Rd.^[4][5] Additionally, US 176 is connected to I-85 with a stoplight-controlled diamond interchange instead of a freeway-to-freeway interchange. The upgraded segment is cosigned with I-585, although it is not officially part of that route.^[6]

Exit list

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

Location	mi[7]	km	Exit	Destinations	Notes
Spartanburg	0.000	0.000	—	US 176 east / SC 9 south (Pine Street)	Continuation east; southern end of US 176/SC 9 concurrency
​	0.170– 0.420	0.274– 0.676	25	US 221 (Whitney Road / Church Street) / SC 9 north (Boiling Springs Road) – Chesnee	Northern end of SC 9 concurrency; official southern terminus; signed as exits 25B (US 221 north/SC 9) and 25A (US 221 south); Chesnee not signed southbound
​	0.900	1.448	24	California Avenue	Northbound exit and southbound entrance
Southern Shops–Valley Falls line	2.076	3.341	23	I-85 BL – Charlotte, Greenville	Signed as exits 23A (south) and 23B (north); exit 5A on I-85 BL
			—	US 176 west to I-85 – Charlotte, Greenville, Inman	Continuation west; northern end of US 176 concurrency
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

Interstate 585 Business

Interstate 585 Business
Location	Spartanburg
Length	1.60 mi[8] (2.57 km)
Existed	1959–?

Interstate 585 Business (I-585 Bus) was a boulevard-grade business route of I-585 along Pine Street, between Whitney Road (US 221) and St. John Street (US 29). It traveled 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.

See also

• United States portal
• U.S. roads portal