U.S. Route 421 in Tennessee
|Maintained by TDOT|
|Length:||43.4 mi (69.8 km)|
|Existed:||1933 – present|
|South end:||US 421 at the NC line near Trade|
|North end:||US 421 at the VA line in Bristol|
|This section does not cite any sources. (November 2013) (Learn how and when to remove this template message)|
US-421 enters Tennessee just north of Zionville, North Carolina, going in a northwesterly direction to, the oldest unincorporated community in the state, Trade. Connecting with SR-67 (hidden concurrency), it soon forms the eastern boundary of the Cherokee National Forest at the intersection of Bulldog Road; then completely in the National Forest after passing Old Prison Camp Road.
In Mountain City, SR-67 splits-off, going southwest towards Elizabethton; SR-91 soon joins afterwards (hidden concurrency). Soon afterwards, US-421 makes traverses through the Iron Mountains, where the road becomes aggressively curvy with elevation changes throughout; at Sandy Gap, US-421 will reach the highest point of its route in Tennessee at 3,862 feet (1,177 m). Once descended from the Iron Mountains, US-421 goes through Shady Valley, where SR-91 splits-off in on a southwesterly direction towards Elizabethton. Soon the highway climbs up Holston Mountain, entering Sullivan County, from Johnson County at Low Gap. This is the second stretch of aggressively curvy with constant elevation changing along US-421, which continues until it reaches Holston Valley, located west of Holston Lake. This whole section, between Mountain City and Holston Valley, is very popular with cycle enthusiasts.
US-421 is joined with SR-44 (hidden concurrency) at Holston Valley, where travelers can make their first chance towards Interstate 81 in Abingdon, Virginia. At Vinegar Hill, US-421 widens to a divided four-lane highway; soon afterwards SR-44 splits-off, continuing southwesterly direction to Bluff City.
Entering Bristol city limits at the intersection of SR-394 and SR-435, the highway reverts to a two-lane road, as it goes through the Fairmount Neighborhood. Near the state line, US-421 connects to Martin Luther King Jr. Boulevard via Andrew Street, before heading north into Virginia.
The entire route is overlapped with SR-34, which was mostly hidden throughout.
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|Johnson||||0.0||0.0||US 421 south – Boone||Continuation from North Carolina|
|Trade||0.8||1.3||SR 67 east – Warrensville||East end of SR-67 overlap|
|Mountain City||10.5||16.9||SR 418 north (Church Street)|
|11.2||18.0||SR 67 west / SR 418 south (Main Street) – Elizabethton||West end of SR-67 overlap|
|11.8||19.0||SR 91 north – Damascus||North end of SR-91 overlap|
|Shady Valley||22.1||35.6||SR 91 south / SR 133 north – Elizabethton, Damascus||South end of SR-91 overlap|
|Sullivan||Holston Valley||34.2||55.0||SR 44 north – Abingdon||North end of SR-44 overlap|
|Vinegar Hill||35.9||57.8||SR 435 south (Bristol Caverns Highway)|
|||38.5||62.0||SR 44 south (Hickory Tree Road) – Bluff City||South end of SR-44 overlap|
|Bristol||40.3||64.9||SR 394 west / SR 435 north (Bristol Caverns Highway)|
|42.9||69.0||SR 34 north (Pennsylvania Avenue)||North end of SR-34 overlap|
|43.2||69.5||SR 34 south (Anderson Street)||South end of SR-34 overlap|
|Tennessee–Virginia line||43.4||69.8||SR 34 north (State Street)||North end of SR-34 overlap|
|US 421 north (Commonwealth Avenue) – Gate City||Continuation into Virginia|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- Media related to U.S. Route 421 at Wikimedia Commons
|U.S. Route 421|