U.S. Route 321

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U.S. Route 321

US 321 highlighted in red
Route information
Auxiliary route of US 21
Length516.9 mi[1][2][3] (831.9 km)
Western York Scenic Byway
Major junctions
South end US 17 in Hardeeville, SC
Major intersections
North end I-40 / SR 73 / SR 95 near Lenoir City, TN
CountryUnited States
StatesSouth Carolina, North Carolina, Tennessee
CountiesSC: Jasper, Hampton, Allendale, Bamberg, Orangeburg, Lexington, Richland, Fairfield, Chester, York
NC: Gaston, Lincoln, Catawba, Burke, Caldwell, Watauga, Avery
TN: Johnson, Carter, Washington, Greene, Cocke, Sevier, Blount, Loudon
Highway system

SC 319SC SC 322
US 311NC NC 343
SR 320TN SR 321

U.S. Route 321 (US 321) is a spur of U.S. Route 21. It runs for 516.9 miles (831.9 km) from Hardeeville, South Carolina to Lenoir City, Tennessee; with both serving as southern termini. It reaches its northernmost point at Elizabethton, Tennessee, just northeast of Johnson City. Because of its unusual "north–south–north" routing, U.S. Route 321 intersects both Interstate 40 and U.S. Route 70 three separate times. The highway serves different roles in each state: An alternate route to interstates in South Carolina, a major highway in North Carolina, and a scenic route in Tennessee.

Route description

  mi km
SC 217.2 349.5
NC 105.5 169.8
TN 194.2 312.5
Total 516.9 831.8

South Carolina

US 321 provides direct access between Savannah and Columbia, serving as an alternate to Interstate 95 and Interstate 26. Starting in Hardeeville, US 321 as a mostly 2 lane highway goes through sparsely populated areas and small towns including Estill, Fairfax, and Denmark, heading in a rather straight and northward direction into the Columbia area, widening to a 5 lane highway right after Neeses, then narrowing down to a 2 lane highway right after the town of North and widening to a 5 lane highway again after Swansea and staying that way until it merges with its parent route US 21 in Dixiana. In Columbia, the route stays concurrent with US 21 through Cayce, over the Congaree River on the Blossom Street Bridge, turning left onto Huger Street, right onto Elmwood Avenue, and left onto North Main Street. The roads separate at Hyatt Park, with US 321 staying west of I-77 and US 21 north of Columbia. The route goes through to communities of Winnsboro, Chester, York, and Clover before entering North Carolina at Bowling Green.

North Carolina

US 321 is an important route in Western North Carolina. It provides an alternative north–south route to I-77, which passes through a busy metropolitan area, and US 221, which is more twisty drive up the Appalachians. Travelers from South Carolina who are going to points west of Charlotte and want to avoid the traffic of I-77 may choose to enter the state on US 321.

The highway traverses through seven counties: Gaston, Lincoln, Catawba, Burke, Caldwell, Watauga, and Avery. US 321 has six control cities: Gastonia, Lincolnton, Hickory, Lenoir, Blowing Rock, and Boone.

US 321 is a multilane highway beginning at the state line. After 7 miles (11 km), it enters the Gastonia area. Traffic on northbound 321 through Gastonia is generally not as heavy as traffic on southbound 321 north of I-85, where it may back up for a couple of miles as drivers wait to turn onto I-85.

The road becomes a freeway at C. Grier Beam Boulevard in Gastonia, just south of NC 275/NC 279. It remains a freeway until just north of its junction with US 70 in Hickory. The freeway bypasses a number of cities that the old US 321 route once passed through. Today, US 321 Business follows the original 38-mile (61 km) route, which serves Maiden, Newton, and Conover, but the freeway is a more direct route to the mountains, and the business route is generally used by local traffic only.

Traffic is usually heavy between Hickory and Lenoir. The North Carolina Department of Transportation (NCDOT) has a long-term plan to widen the road to six lanes, which is expected to begin after 2020.[4]

North of Lenoir, US 321 is a four-lane divided highway, continuing up the steep escarpment of the Blue Ridge Mountains. Until early 2018, the road was a narrow two-lane highway from near Patterson through Blowing Rock. Work on this area continued for much of the first two decades of the 21st century. The widening of US 321 through Blowing Rock was and continues to be seen as a controversial project. Many residents of the town felt that a four-lane highway would destroy the character of the small town, and they proposed several bypass alternatives. NCDOT selected the widening as its preferred alternative, but added several features such as underground utilities, sidewalks, landscaping, and rock walls to make the widening more palatable to the residents opposed to it.[5] These features were not present on the two-lane highway that was replaced. The final portion of the widening project, at the steepest part of the road just south of Blowing Rock, began in 2012 and was completed in 2018.[6] Some landscaping work remains which will commence in Fall 2018 as its own project, constructed separately for beautification of the route through town.

North of Blowing Rock, US 321 is already a highway of four lanes up to King Street in Boone; thus, US 321 is a four-lane highway from the South Carolina state line to downtown Boone. Currently, US 321 meets US 421 at King Street and overlaps it over King Street to leave town to the west. NCDOT project R-2615 is proposed to widen the US 321/421 concurrency from this junction to their junction near Vilas, although this project is currently unfunded.[7] There is a feasibility study (FS-0511A) in progress to examine the possibility of widening US 321 from the junction near Vilas to the Tennessee state line. If both of these projects were completed, then US 321 would be a four-lane highway through the entire state.


Former portion of US 321 in Parrottsville, Tennessee, facing south before it was rerouted.

As it crosses into Tennessee, US 321 enters the Cherokee National Forest, and continues westward through the rugged valley between Pond Mountain on the south and Watauga Lake on the north. The highway passes numerous campgrounds, boat launches, and other lake-related recreational areas as it winds its way along the shores of the lake. South of Butler, the highway joins SR 67, which enters from the Mountain City area to the northeast. The Appalachian Trail crosses US 321 at its intersection with Shook Gap Road, just before the highway exits the national forest. At Hampton, US 321 intersects US 19E, and the two highways run concurrently northward into Elizabethton.

US 321 inverts directions in Elizabethton: the road is designated as southbound in both directions driving away from its intersection with US 19E.[8] It is conterminous with US 11E through portions of Washington and Greene counties. In Greeneville, the highway continues south into Cocke County. At the Cocke-Greene County line US 321 becomes a four-laned divided highway and bypasses Parrottsville. The four-lane section ends just before US 321's junction with SR 160 and crossing I-40 at Newport.

US 321 (Lamar Alexander Parkway) in Maryville

The stretch of US 321 from Newport south to Cosby and southwest through Pittman Center to Gatlinburg parallels the northern boundary of the Great Smoky Mountains National Park and is quite scenic. From a point between Newport and Cosby to the intersection with the Little River Road, it is concurrent with SR 73. In Pigeon Forge, concurrent with US 441/Great Smoky Mountains Parkway, US 321 is a divided, multi-lane traffic-laden thoroughfare where it serves as the city's main route, lined with hotels, outlet malls and amusement facilities. Veering southwest of Pigeon Forge, the highway takes on a more rural character as it traverses Wears Valley, and narrows down to two lanes until its junction with SR 73 Scenic (the Little River Road) at the Townsend entrance to the park. It is concurrent with SR 73 from this junction to its terminus. With the exception of a 3-mile (4.8 km) section between Townsend and Maryville, the remaining portions of the highway through Blount County are a minimum of four lanes and usually a divided highway. Once the highway reaches Fort Loudon Dam in Loudon County, it crosses the Tennessee River via a bridge, completed in 2017, southeast of the dam then intersects with US 11 in Lenoir City. US 321 has a wrong-way concurrency with SR 95 from a point several miles south of Lenoir City (near Greenback) to its terminus at I-40. In the northern part of Lenoir City, US 321 intersects I-75 and US 70 before reaching I-40. Beyond I-40, the road continues northward to Oak Ridge as the two-lane SR 95.

US 321 is a four-lane semi-divided thoroughfare from I-40 and I-75 to the Great Smoky Mountains National Park, except for the 3-mile (4.8 km) stretch near Walland.


North Carolina Highway 17

North Carolina Highway 17

LocationPropst CrossroadsBoone, NC
Length55.9 mi[9] (90.0 km)

North Carolina Highway 17 (NC 17) was an original state highway that traversed from Hickory to Boone, through Granite Falls, Hudson, Lenoir and Blowing Rock. In 1930, it was extended south on new primary routing to NC 113, in Propst Crossroads; also same year, US 321 was established in the state and overlapped NC 17 between Hickory and Boone.[10] In 1934, NC 17 was decommissioned, with US 321 taking all north of Hickory and NC 96 taking all south.[11]

North Carolina Highway 155

North Carolina Highway 155

LocationDallasConover, NC
Length29.4 mi[12] (47.3 km)

North Carolina Highway 155 (NC 155) was established in 1994 following the old alignment of US 321 as it was moved onto new four-lane controlled-access highway.[13] From NC 275/NC 279, in Dallas, it traversed north through High Shoals to Lincolnton. Sharing a short concurrency with NC 150 as it bypass the downtown area of Lincolnton, it continues north meeting with main US 321, south of Maiden, continuing in concurrency through Newton and finally Conover, where it ended at US 70. In 1999, the remainder of US 321 was moved onto new freeway bypass west of Newton and Conover; at same time, NC 155 was decommissioned and absorbed into US 321 Business.[14]

North Carolina Highway 603

North Carolina Highway 603

LocationTN State LineSugar Grove, NC


In addition to the widening project, there have also been talks of a freeway-to-freeway connection with Interstate 85 in Gastonia that would greatly relieve traffic flowing through the junction. Currently, US 321 is a surface road at the I-85 interchange, and is a limited access freeway a few hundred yards north. To extend the freeway to I-85, the remaining at-grade intersections and traffic lights would have to be eliminated.

Major intersections

South CarolinaJasperHardeeville0.00.0 US 17 (Whyte Hardee Boulevard) – Ridgeland, Savannah
SC 46 east (Church Road)
To Millstone Landing
SC 336 east (Tillman Road) – Ridgeland
US 601 north (Cypress Branch Road) – Hampton
Southern terminus of US  601
Robertville22.636.4 SC 462 (Gillson Branch Road) – Pineland
SC 119 south (Clyo Road) – Clyo, Springfield
Scotia30.749.4 SC 333 (Scotia-Furman Highway) – Furman
SC 3 south (Third Street) – Lena
South end of SC 3 overlap
SC 3 north (Nixville Road) – Barnwell
North end of SC 3 overlap
SC 363 east (Luray Highway) – Hampton
To Lake Warren State Park
AllendaleFairfax49.980.3 US 278 (Allendale-Hampton Highway) – Allendale, Hampton
Sycamore55.689.5 SC 641 (Confederate Highway) – Allendale
US 301 south (Burton's Ferry Highway) – Allendale
South end of US 301 overlap
US 301 north (Main Highway) – Bamberg
North end of US 301 overlap
Olar66.5107.0 SC 64 (Low Country Road) – Barnwell
SC 70 south (Hagood Street) – Barnwell
South end of SC 70 overlap
76.9123.8 US 78 (Heritage Highway) – Bamberg, Blackville
SC 70 north (Country Club Road) – Orangeburg
North end of SC 70 overlap
SC 332 east (Cope Road) – Cope
East end of SC 332 overlap

SC 332 west / SC 400 east (Norway Road) – Springfield, Orangeburg
West end of SC 332 overlap
Neeses90.9146.3 SC 4 (Neeses Highway) – Springfield, Orangeburg
SC 389 west (Ninety Six Road) – Perry, Wagener
North97.3156.6 US 178 (North Highway) – Pelion, Orangeburg
SC 3 south (Whetstone Road) – Springfield, Blackville, Barnwell
SC 692 south (Fifth Street) – Orangeburg
To Swansea High Football Stadium
SC 6 west (Second Street) – Lexington
West end of SC 6 overlap
SC 6 east (First Street) – St. Matthews
East end of SC 6 overlap

US 21 south / US 176 east (Charleston Highway) – Orangeburg
South end of US 21 and east end of US 176 overlap

To I-77 north / Fish Hatchery Road – Charlotte
120.6194.1 I-26 – Charleston, Spartanburg
SC 2 north (Frink Road)
West Columbia123.3198.4
SC 302 south (Airport Boulevard) – Aiken, Columbia Metropolitan Airport
125.0201.2 SC 2 (State Street)

SC 48 Truck east (Blossom Street east / US 21 Conn. east / US 76 Conn. east)
Western terminus of US 21 Conn., the western segment of US 76 Conn., SC 48 Truck, and Blossom Street; US 21, US 176, and US 321 turn left off of Blossom Street onto Huger Street.
126.5203.6 US 1 / US 378 (Gervais Street)To South Carolina State House
126.8204.1 SC 12 (Hampton/Tylor Streets)To Finlay Park and Columbia Museum of Art

I-126 west / US 76 west – Greenville, Spartanburg
West end of US 76 overlap
US 76 east (Elmwood Avenue)
East end of US 76 overlap
US 176 west (River Drive)
West end of US 176 overlap
129.2207.9 SC 16 (Sunset Drive)
SC 215 north (Montichello Road)
To Columbia International University
US 21 north (Main Street)
North end of US 21 overlap; Columbia College at intersection
132.2212.8 I-20 – Florence, Augusta
SC 269 south (Hinnants Store Road)
Winnsboro Mills152.4245.3
SC 34 east – Ridgeway
East end of SC 34 overlap; to South Carolina Railroad Museum

US 321 Bus. north (Columbia Road) / SC 213 west (Monjicono Road) – Monticello

SC 34 west (Newberry Road) / SC 200 east – Newberry, Great Falls
West end of SC 34 overlap

US 321 Bus. south (Congress Street)
SC 97 south (Great Falls Road) – Great Falls, Camden
South end of SC 97 overlap

US 321 Bus. north (Columbia Road)

SC 9 south / SC 72 east / SC 97 north / SC 121 north (J.A. Cochran Bypass)
South end of SC 9, east end of SC 72, and north end of SC 97/SC 121 overlap

SC 72 west / SC 121 south (West End Road) – Carlisle, Whitmire
West end of SC 72 and south end of SC 121 overlap

SC 9 Bus. south (Pinckney Street)
SC 9 north (Pinckney Street) – Lockhart
North end of SC 9 overlap

US 321 Bus. south / SC 97 (Center Road) – Hickory Grove
SC 909 south (Old York Road) – Lewis
SC 322 west (Church Street)
West end of SC 322 overlap
SC 322 east (McConnells Highway) – Rock Hill
West end of SC 322 overlap; to Historic Brattonsville
US 321 Bus. (Congress Street)
203.7327.8 SC 49 (Sharon Road) – Sharon, Union

SC 5 Bus. / SC 161 Bus. south (Liberty Street) – Blacksburg
South end of SC 161 Bus overlap
US 321 Bus. (Kings Mountain Street)
SC 5 / SC 161 south (Alexander Love Highway) – Blacksburg
South end of SC 161 and north end of SC 161 Bus overlap
SC 161 north – Bethany
North end of SC 161 overlap
Clover213.4343.4 SC 55 (Kings Mountain/Bethel Streets) – Lake Wylie, Blacksburg
South Carolina–North Carolina state line
North CarolinaGastonGastonia7.311.7Garrison Boulevard
7.912.7 US 29 / US 74 (Franklin Boulevard)
NC 7 east (Long Avenue)
9.415.1 I-85 – Charlotte, Spartanburg
Dallas9.415.1Grier Beem Boulevard – Gaston CollegeSigned exit 11

US 321 Bus. north / NC 275 / NC 279 (Dallas-Cherryville Highway) – Cherryville
Signed exits 12A-B Northbound and exit 12 Southbound
16.125.9Hardin RoadSigned exit 17
US 321 Bus. (Gastonia Highway) – High Shoals, Lincolnton
Signed exit 20
Lincolnton23.638.0 NC 27 / NC 150 (Main Street) – LincolntonSigned exit 24
US 321 Bus. (Maiden Highway) – Maiden
Signed exit 28
CatawbaMaiden32.352.0Startown RoadSigned exit 33
36.258.3 NC 10 – NewtonSigned exit 37
40.164.5River RoadSigned exit 41
Mountain View41.466.6 NC 127 (Brookford Boulevard)Signed exit 42
Hickory42.368.1 I-40 – Statesville, AshevilleSigned exits 43A (east) and 43B (west)

US 70 / US 321 Bus. south to NC 127 (Conover Boulevard) – Hickory
Signed exit 44
45.372.9Clement Boulevard – Hickory Regional Airport
BurkeNo major intersections
US 321A north – Granite Falls
Granite Falls50.180.6Falls Avenue – Granite Falls
Lenoir56.891.4Southwest Boulevard – Morganton
US 321A south – Hudson
US 64 / NC 18 / NC 90 east – Lenoir, Wilkesboro
East end of NC 90 overlap
NC 90 west (Main Street) – Lenoir, Collettsville
West end of NC 90 overlap
NC 268 east – Fort Defiance
WataugaBlowing Rock79.4127.8

US 321 Bus. north (Main Street)

US 221 south / US 321 Bus. south
South end of US 221 overlap
81.4131.0 Blue Ridge ParkwayTo Moses H. Cone Memorial Park and Julian Price Memorial Park
US 221 north / NC 105 – Linville, Banner Elk, Newland
North end of US 221 overlap

US 421 south / NC 194 north (King Street)
South end of US 421 and north end of NC 194 overlap
NC 194 south – Valle Crucis
South end of NC 194 overlap
Sugar Grove94.3151.8
US 421 north – Mountain City
North end of US 421 overlap
AveryNo major intersections
North Carolina–Tennessee state line
SR 67 east – Mountain City
East end of SR 67 and west end of SR 159 (hidden) overlap
US 19E south (SR 37) – Roan Mountain
South end of US 19E overlap
Elizabethton27.243.8 US 19E / SR 91 (SR 37) – Bluff CityNorth end of US 19E and SR 91 overlap
Route transition from northbound to southbound
SR 400 south – Watauga
SR 91 / SR 362 south
South end of SR 91 overlap
SR 359 south – Milligan College
WashingtonJohnson City35.356.8Legion Street / Milligan HighwayInterchange
35.857.6 I-26 / US 19W / US 23 – Erwin, KingsportIntrechange; exit 24 (I-26)
SR 67 west / SR 381 (Cherokee Road)
West end of SR 67 and south end of SR 381 overlap
US 11E / SR 381 north (SR 34 / State of Franklin Road)
North end of US 11E and SR 381 overlap
Jonesborough44.371.3 SR 354 (Boones Creek Road) / Boone Street – Boones Creek, Business District

To SR 81 / Washington Drive – Kingsport, Erwin, Business District

To SR 81 / Persimmon Ridge Road – Lamar, Erwin
SR 75 north (Opie Arnold Road)
Greene58.093.3 SR 351 (Chuckey Pike) – Chuckey, Rheatown
SR 107 east (Tusculum Bypass) – Erwin, Tusculum College
East end of SR 107 (hidden) overlap
GreenevilleErwin Highway – Tusculum, Tusculum CollegeFormer SR 107

US 11E Bus. south (SR 107 / Tusculum Boulevard)
West end of SR 107 (hidden) overlap
66.0106.2Snapps Ferry RoadInterchange

US 11E south (SR 34) / SR 93 north (Kingsport Highway) – Kingsport, Morristown
South end of US 11E overlap; southern terminus of SR 93
SR 172 north (Baileyton Road) – Baileyton, Airport
Southern terminus of SR 172

US 11E Bus. north (SR 107 / Tusculum Boulevard)
North end of US 11E Bus. overlap

US 11E Bus. south (SR 350 / West Summer Street) / SR 350 north
South end of US 11E Bus. overlap
SR 350 south (McKee Street)
South end of SR 350 (hidden) overlap
SR 70 / SR 107 west (Asheville Highway)
West end of SR 107 (hidden) overlap
SR 349 west (Warrensburg Road)
Eastern terminus of SR 349
CockeParrottsville87.3140.5 SR 340 – Parrottsville, Del Rio
SR 160 north – Bybee
Southern terminus of SR 160
US 25 south / US 70 (SR 9 / Broadway Street)
South end of US 25 and east end of US 70 overlap

US 25 north (SR 9) / US 70 west (SR 35) / SR 32 north (Broadway Street)
North end of US 25 / SR 32 and west end of US 70 overlap
95.5153.7 I-40 – Knoxville, AshevilleI-40 exit 435
SR 73 north (Wilton Springs Road)
North end of SR 73 (hidden) overlap
SR 339 west (Jones Cove Road) – Cherokee Hills
Eastern terminus of SR 339
Foothills Parkway to I-40
Western terminus of section 8A of the Foothills Parkway
SR 32 south
South end of SR 32 overlap
SevierPittman Center119.9193.0
SR 416 north (Pittman Center Road)
Southern terminus of SR 416
GatlinburgPittman Center line120.8194.4
SR 454 north (Buckhorn Road)
Southern terminus of SR 454

US 441 south / SR 73 Scenic west (Parkway/SR 71) – Great Smoky Mountains National Park
South end of US 441 overlap; eastern terminus of SR 73 Scenic
127.2204.7Gatlinburg Parkway BypassGreat Smoky Mountains National ParkNo access from northbound US 441/US 321
Pigeon Forge134.5216.5
US 441 north (Parkway/SR 71) – Sevierville
North end of US 441 overlap
Wears Valley142.9230.0Foothills ParkwayInterchange; eastern terminus of western section of Foothills Parkway

SR 73 Scenic east (East Lamar Alexander Parkway/SR 337) – Great Smoky Mountains National Park
Western terminus of SR 73 Scenic
Walland156.8252.3Foothills ParkwayTop of The World, Chilhowee Lake, Great Smoky Mountains National Park Look Rock areaInterchange

SR 447 north (Washington Street) to US 411 north
Southern terminus of SR 447
SR 336 south (Montvale Road)
Northern terminus of SR 336
167.6269.7 US 411 (Broadway Avenue/SR 33) – Rockford, Madisonville
168.7271.5 US 129 (SR 115) – Alcoa, Knoxville
SR 335 north (Old Glory Road)
North end of SR 335 overlap
SR 335 south (William Blount Drive)
South end of SR 335 overlap
SR 333 north (Main Avenue) – Friendsville
Southern terminus of SR 333
SR 95 south (Lenoir City Road) – Greenback
South end of SR 95 (hidden) overlap
SR 444 west (Tellico Parkway) – Tellico Village
Eastern terminus of SR 444
Lenoir City186.8300.6 US 11 (Broadway Street/SR 2) – Knoxville, Loudon, Farragut
189.5305.0 I-75 – Knoxville, ChattanoogaI-75 exit 81
190.3306.3 US 70 (Kingston Pike/SR 1) – Knoxville, Kingston
I-40 / SR 95 north (White Wing Road) – Knoxville, Nashville, Oak Ridge
West end of SR 73 (hidden) and north end of SR 95 (hidden) overlap; I-40 exit 364
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  •       Concurrency terminus
  •       Route transition
  •       Unopened

Special routes

Winnsboro business loop

Business plate.svg

U.S. Highway 321 Business

LocationWinnsboro, South Carolina
Length4.350 mi[15] (7.001 km)

U.S. Route 321 Business (US 321 Bus.) is a 4.350-mile (7.001 km) business route of US 321 that exists in Winnsboro Mills and Winnsboro, via Columbia Road and Congress Street.[16] It was established around 1951 or 1952, when mainline US 321 was rerouted west, bypassing Winnsboro.

Chester business loop

Business plate.svg

U.S. Highway 321 Business

LocationChester, South Carolina
Length3.670 mi[17] (5.906 km)

U.S. Route 321 Business (US 321 Bus.) is a 3.670-mile (5.906 km) business route of US 321 in the city of Chester. It traverses downtown Chester, via Columbia Street and Center Road.[18] It was established between 1962 and 1964, when mainline US 321 was rerouted west, bypassing Chester.

York business loop

Business plate.svg

U.S. Highway 321 Business

LocationYork, South Carolina
Length2.500 mi[19] (4.023 km)

U.S. Route 321 Business (US 321 Bus.) is a 2.500-mile (4.023 km) business route of US 321 in the city of York, utilizing Congress Street and Kings Mountain Street.[20] It was established around 1957–1958, when mainline US 321 was rerouted west, bypassing York.

Dallas–Hickory business loop

Business plate.svg

U.S. Highway 321 Business

LocationDallasHickory, NC
Length37.2 mi[21] (59.9 km)

U.S. Route 321 Business (US 321 Bus) was established in June 1999, as a renumbering all of NC 155 and part of mainline US 321 in Catawba County. Traversing 37.2 miles (59.9 km) through Gaston, Lincoln and Catawba counties, it connects the cities and towns of Dallas, High Shoals, Lincolnton, Maiden, Newton, Conover and Hickory. The highway follows the original US 321 routing through that existed prior to 1994.[14]

Lincolnton alternate route

U.S. Highway 321A

LocationLincolnton, North Carolina
Length3.4 mi[22] (5.5 km)

U.S. Route 321 Alternate (US 321A) was established 1956 when mainline US 321 was placed on new bypass east of downtown Lincolnton. It traversed along Aspen Street and around the Lincoln County Civil Court on Court Square Drive. In 1960 it was decommissioned, with Aspen Street becoming secondary roads.

Granite Falls–Lenoir alternate route

U.S. Highway 321A

LocationGranite FallsLenoir, NC
Length11.8 mi[23] (19.0 km)

U.S. Route 321 Alternate (US 321A) was established 1948 as a number swap with US 321 through downtown Lenoir. In 1957, US 321A was extended south, replacing mainline US 321 through Granite Falls and Hudson, ending at its current southern terminus north of the Catawba River. In June 1964, US 321A was placed on one-way splits through downtown Lenoir; northbound continued along Mulberry Street and West Avenue, southbound rerouted along Main Street and College Avenue. In September 2006, US 321A was rerouted to its current northern terminus, just south of downtown Lenoir, via McLean Drive. Its old alignment through downtown Lenoir was carried on by NC 90 until 2012, when it too was rerouted; the old alignment is now under city control.[24][25][26]

Traversing through Granite Falls, Sawmills, Hudson and Lenoir US 321A has not changed much over the years. Predominantly a two-lane highway, it parallels a short line railroad and connects to several factories and downtowns.

Lenoir alternate route

U.S. Highway 321A

LocationLenoir, North Carolina
Length5.9 mi[27] (9.5 km)

U.S. Route 321 Alternate (US 321A) was established 1941 as a new alternate route bypassing Lenoir. In 1948, it was replaced by mainline US 321.

US 221/US 321 Bus. in Blowing Rock

Blowing Rock business loop

Business plate.svg

U.S. Highway 321 Business

LocationBlowing Rock, North Carolina
Length2.0 mi[28] (3.2 km)

U.S. Route 321 Business (US 321 Bus) was established 1960 as an upgrade to secondary roads through downtown Blowing Rock; which were originally part of mainline US 321 until about 1954, when it was moved onto a new bypass east. The highway traverses along Main Street and shares a concurrency with US 221 for 0.8 miles (1.3 km) on its northern section.

US 221 Truck/US 321 Truck/US 421 Truck/NC 105 traveling concurrent through the Boone area

Boone truck route

Truck plate.svg

U.S. Highway 321 Truck

LocationBoone, North Carolina
Length4.0 mi[29] (6.4 km)

U.S. Route 321 Truck (US 321 Truck) redirects truckers traveling through the area to go south and around downtown Boone, via NC 105 and NC Highway 105 Bypass (SR-1107). The shares some overlap with US 221 Truck and complete overlap with US 421 Truck.

Greeneville truck route

Truck plate.svg

U.S. Route 321 Truck

LocationGreeneville, Tennessee
Length3.6 mi (5.8 km)

U.S. Route 321 Truck (US 321 Truck) redirects truckers traveling south on US 321 around downtown. It shares a concurrency with US 11E and SR 70. The route begins at US 11E/US 321 and ends 3.6 miles (5.8 km) later at US 321/SR 70.

The entire route is in Greeneville, Greene County.

US 321 / SR 35 (West Main Street) / SR 70 south (Asheville Highway) / SR 107 (Asheville Highway / West Main Street) – Greeneville, Parrottsville, Newport, Del Rio, Asheville
Southern terminus of US 321 Truck and end SR 70 overlap

US 11E Bus. north (West Summer Street) / SR 350 south (West Summer Street) – Downtown Greeneville
Begin US 11E Business concurrency; Northern terminus of SR 350

US 11E south / SR 34 south (West Andrew Johnson Highway) / Blue Springs Parkway – Mosheim, Bulls Gap, Morristown
Southern terminus of US 11E Business; Begin US 11E/SR 34 overlap
SR 70 north (Lonesome Pine Trail) – Romeo, Rogersville
End SR 70 overlap
SR 172 north (Baileyton Road) / WhiteHouse Road – Baileyton, Airport
Southern terminus of SR 172; Interchange

US 11E north / US 321 (North Main Street / East Andrew Johnson Highway) / SR 34 north (East Andrew Johnson Highway) / SR 35 south (North Main Street) – Jonesborough, Johnson City, Newport, Downtown Greeneville
End US 321 Truck
SR 93 north (Kingsport Highway) – Fall Branch, Kingsport
Southern terminus of SR 93
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Google (December 22, 2013). "U.S. Route 321 in South Carolina" (Map). Google Maps. Google. Retrieved December 22, 2013.
  2. ^ a b Google (December 22, 2013). "U.S. Route 321 in North Carolina" (Map). Google Maps. Google. Retrieved December 22, 2013.
  3. ^ a b Google (December 22, 2013). "U.S. Route 321 in Tennessee" (Map). Google Maps. Google. Retrieved December 22, 2013.
  4. ^ webmaster. "NCDOT: U.S. 321 Widening from Hickory to Lenoir". www.NCDOT.gov. Retrieved January 17, 2018.
  5. ^ "NCDOT: US 321 Improvements, Blowing Rock". Retrieved October 22, 2010.
  6. ^ "U.S. 321 Widening Project in Blowing Rock Continues, Hopefully Finished by Winter - High Country Press". www.HCPress.com. Retrieved January 17, 2018.
  7. ^ "NCDOT: TIP".
  8. ^ "The US 321 Directional Change". Retrieved October 22, 2010.
  9. ^ Google (May 18, 2014). "North Carolina Highway 17" (Map). Google Maps. Google. Retrieved May 18, 2014.
  10. ^ State Highway System of North Carolina (PDF) (Map). Cartography by NCDOT. North Carolina Department of Transportation. 1930. Retrieved May 18, 2014.
  11. ^ North Carolina Primary Highway System (PDF) (Map). Cartography by NCDOT. North Carolina Department of Transportation. 1940. Retrieved May 18, 2014.
  12. ^ Google (May 18, 2014). "North Carolina Highway 155" (Map). Google Maps. Google. Retrieved May 18, 2014.
  13. ^ "Route Change (1994-10-18)" (PDF). North Carolina Department of Transportation. October 18, 1994. Retrieved May 18, 2014.
  14. ^ a b "Route Change (1999-06-25)" (PDF). North Carolina Department of Transportation. June 25, 1999. Retrieved May 18, 2014.
  15. ^ "Highway Logmile Report". South Carolina Department of Transportation. Retrieved December 11, 2020.
  16. ^ Google (December 1, 2013). "Overview map of US 321 Bus. (Winnsboro, South Carolina)" (Map). Google Maps. Google. Retrieved December 1, 2013.
  17. ^ "Highway Logmile Report". South Carolina Department of Transportation. Retrieved December 11, 2020.
  18. ^ Google (December 1, 2013). "Overview map of US 321 Bus. (Chester, South Carolina)" (Map). Google Maps. Google. Retrieved December 1, 2013.
  19. ^ "Highway Logmile Report". South Carolina Department of Transportation. Retrieved December 11, 2020.
  20. ^ Google (December 1, 2013). "Overview map of US 321 Bus. (York, South Carolina)" (Map). Google Maps. Google. Retrieved December 1, 2013.
  21. ^ Google (December 1, 2013). "US 321 Business - Dallas-Hickory, North Carolina" (Map). Google Maps. Google. Retrieved December 1, 2013.
  22. ^ Google (December 1, 2013). "US 321A - Lincolnton, North Carolina" (Map). Google Maps. Google. Retrieved December 1, 2013.
  23. ^ Google (December 1, 2013). "US 321A - Granite Falls-Lenoir, North Carolina" (Map). Google Maps. Google. Retrieved December 1, 2013.
  24. ^ "US 321A Route Change (1964-06-04)" (PDF). North Carolina Department of Transportation. June 4, 1964. Retrieved December 1, 2013.
  25. ^ "US 321A Route Change (2006-09-07)" (PDF). North Carolina Department of Transportation. September 7, 2006. Retrieved December 1, 2013.
  26. ^ "Correction to Caldwell County Route" (PDF). North Carolina Department of Transportation. December 11, 2012. Retrieved December 1, 2013.
  27. ^ Google (December 1, 2013). "US 321A - Lenoir, North Carolina" (Map). Google Maps. Google. Retrieved December 1, 2013.
  28. ^ Google (December 1, 2013). "US 321 Business - Blowing Rock, North Carolina" (Map). Google Maps. Google. Retrieved December 1, 2013.
  29. ^ Google (December 4, 2013). "US 321 Truck - Boone, North Carolina" (Map). Google Maps. Google. Retrieved December 4, 2013.

External links