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Interstate 585

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Interstate 585 marker

Interstate 585

North Pine Street
I-585 highlighted in red
Route information
Auxiliary route of I-85
Maintained by SCDOT
Length2.25 mi[1][2] (3.62 km)
Existed1962[citation needed]–present
NHSEntire route
Major junctions
South end US 176 / US 221 / SC 9 in Spartanburg
North end I-85 BL / US 176 near Spartanburg
CountryUnited States
StateSouth Carolina
Highway system
SC 576 US 601

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.

Route description[edit]

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]


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[edit]

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


US 176 east / SC 9 south (Pine Street)
Continuation as US 176/SC 9

SC 9 north (Boiling Springs Road) / Whitney Road south / North Church Street south (US 176 Conn. east) to US 221 – Boiling Springs
Southern end of SC 9 concurrency; official southern terminus of I-585; western terminus of US 176 Conn.; northern terminus of Whitney Road and North Church Street; signed exit 25B (US 221) and 25A (SC 9 northbound) on I-585 northbound; no northbound entrance from exit 25A
0.9001.44824California AvenueNorthbound exit and southbound entrance
Southern ShopsValley Falls line2.067–
23 I-85 BL – Charlotte, GreenvilleSigned as exits 23A (south) and 23B (north); official northern terminus of I-585

US 176 west to I-85 – Charlotte, Greenville, Inman
Continuation as US 176 west
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Interstate 585 Business[edit]

Interstate 585 Business marker

Interstate 585 Business

Length1.60 mi[8] (2.57 km)

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[edit]


  1. ^ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved August 30, 2022.
  2. ^ "Statewide Highways (shapefile)" (zip). South Carolina Department of Transportation. September 29, 2017. Retrieved December 8, 2017.
  3. ^ Google (May 20, 2013). "Overview map of I-585" (Map). Google Maps. Google. Retrieved May 20, 2013.
  4. ^ "I-585 Groundbreaking Ceremony Held Thursday, Aug. 21". info2.scdot.org. Retrieved December 28, 2023.
  5. ^ "Ribbon Cutting Ceremony Held for Interstate 585 Highway Infrastructure Project in Spartanburg County". info2.scdot.org. Retrieved December 28, 2023.
  6. ^ "Greenville Spartanburg Metro 2018" (PDF). SCDOT. April 2021. Retrieved May 30, 2021.
  7. ^ "Highway Logmile Report". South Carolina Department of Transportation. Retrieved January 9, 2021.
  8. ^ Google (May 19, 2013). "Overview map of I-585 Bus. (Spartanburg, South Carolina)" (Map). Google Maps. Google. Retrieved May 19, 2013.

External links[edit]

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